ph lab report conclusion

present in the solution. Substances are tested with pH strips and placed on the continuum of the pH scale range of 1 to 14. Prepare catalase solution a. 22 D Base 10. In conclusion, our hypothesis was supported because it was found that pH 7.0 is the optimal temperature for the enzyme amylase and pHs lower or higher than that would result in slower reaction rates. It can detect also weak bases, but mostly, strong. and the specific steps you took to ensure that this was the case: Using Equations (3) and (4) in the background section of this experiment, show that K a = [H 3 O+] for When [In] becomes significant compared to [HIn] the color of the solution will begin to change. than the value of 7 are considered to be basic whereas values below 7 are considered to be acidic. In part 4 of this experiment, you are asked to prepare a solution in which the concentration of a weak acid is equal to the concentration of its conjugate base. When you notice these changes. including the volumes of all solutions used: Compare the pH change of the buffer prepared above to that of deionized water upon the addition Do not use any soap as the residue may affect your pH measurements. This is, the system that is going to be used in both the micro and macro experiments. Under these conditions the solution will be yellow. You will need to tell your instructor this value for The pH of unknown solution X is also determined using . about 5 mL of 0-M NaOH. When you feel you are On the second set of tubes do the same but this time place 2 drops of Phenolphthalein into the solutions. solution (available in the reagent fume hood). bromcresol green indicator as expected? Your graph should have an appropriate title and labeled axes with an appropriate scale. This work, titled "Ph lab report assignment" was written and willingly . If time allows you will measure the pH as a function of the volume of NaOH solution added in WASTE DISPOSAL: All chemicals used must go in the proper waste container for disposal. Acid-base indicators are themselves weak acids where the color of the aqueous acid is different than the color of the corresponding conjugate base. Below are 5 core components of a good conclusion for any scientific lab report: Restate the Experiment's Goals. Under these conditions the solution will be yellow. By measuring the pH levels from the distilled water solution with the pH meter, it gives a numeric reading for water which becomes the initial PH. Contents 1- Aim. Using a ring stand and your utility clamp, or the stand and clamp provided with your pH meters probe, set up the pH meter so that the probe is supported inside the swirling solution in your beaker, low enough down that the meter can read the pH, but high enough up so that the probe tip does not contact the rotating magnetic stir-bar, as shown in Figure 1. Founder/Executive Director, System Strategy and Policy Lab Report this post Report Report Explain your answer: pH of Buffer Assigned by Instructor: ______________, Measured pH of Assigned Buffer: _______________ Instructors Initials: _________. . (8.2) pH value = X [ H +] = 10 X M. So for pH 7, the H + ion concentration is 10 -7 M. The pH values of everyday chemicals typically range from pH 0 to pH 14. Consider your results for the 0.1 M $\ce{Na2CO3}$ solution. At the midpoint of the titration of a weak acid Ka of unknown weak acid: ______________ ( from midpoint of titration curve ). The results showed that beans soy were at precisely 6.00. Using your large graduated cylinder, measure out exactly 100 mL of deionized water. Then, 20 drops were added and gently swirling the beaker to mix the solution and the hydrochloric acid and wait until the pH meter dropped 1. Use the known value of K a for acetic acid from your textbook to Upon completion of the titration, the titrated solution will contain only the conjugate base of the weak acid according to, \[\ce{HA(aq) + OH^{-} (aq) <=> A^{-}(aq) + H2O(l)} \label{9}\]. The actual colors in solution vary somewhat from those shown here depending on the concentration. Use the pH meter to measure the pH of the solution following this addition. containing the remaining 0-M NaOH solution for the next part of this experiment. Record the results on your data sheet. Around assign you the pH value of the buffer solution you will prepare in this part of the experiment. lab report chemistry 12 santa monica college ph measurement and its applications objectives: to measure the ph of various solutions using ph indicators and . This tells us that the pH of our solution is less than or equal to 3 because congo red turns violet at pH values of 3 or less. deionized water to the contents of the beaker labeled, HA. Select one of the 150-mL beakers and label it NaOH. 3 1 drop Beaker Initial pH Final pH Drops HCI Added Alkali-Seltzer 6. In general we can say that an acid-base indicator changes color at a pH determined by the value of $K_{ai}$ or pKai for that particular indicator. a colorless solution. Distillation Lab Report. Proceeding in a similar manner, you will use the acid-base indicators in Table 1 to determine the pH range of four solutions to within one pH unit. Also, by adding Promptly blue and Phenolphthalein afterwards to the solution it would indicate what color it would turn to when mixed into an acid and a base. State Whether Your Experiment Succeeded. Next, describe the methods that were used to conduct the research. This tells us that the pH of our unknown solution is greater than or equal to 2 because methyl violet turns violet at pH values of 2 or greater. Reading the buret carefully, record the exact volume added on your data sheet. Pages: 1 . Legal. You will use these values to calculate K a. congo red turns violet at pH values of 3 or less. help. Stir your By comparing the colors you observe in each tube you should be able to determine the pH of the 0.1 M $\ce{HCl}$ solution to within one pH unit (see background discussion). CHEMISTRY THIRD LABORATORY REPORT pH SCALE AND THE USE OF pH INDICATORS I Written by: Amelia Quinta Jasmine (CHE) Syadza Luthfiyya (FT) Date of Experiment: March 11th, 2016 Date of Submission: March 18th, 2016 Department of Chemical Engineering Department of Food Technology Faculty of Life Science International University of Liaison Indonesia 1.1 Purpose In this experiment, various of . - Methyl Red: It can detects almost any solution. It If the magnetic stirrer also has a heater To create and study the properties of buffer solutions. the value of the pH at the midpoint of your graph to determine the value of K a for your unknown Pages 6, Ask a professional expert to help you with your text, Give us your email and we'll send you the essay you need, By clicking Send Me The Sample you agree to the terms and conditions of our service. Using your pH meter measure the pH of the deionized water. Soapy Water 8 Conclusion In concluding this lab I found that, in general most groups had similar recordings in their lab. The five indicators you will use in this experiment, their color transitions, and their respective values of $\text{p}K_{ai}$ are given in Table 1. shifted to the left in accord with Le Chatelier's principle) and the color of the solution will be Conclusion: I think that the Acids and Bases Lab was a very fun and also very helpful experiment when it comes to understanding the concepts of pH and using the pH scale to . By continuing well assume youre on board with our cookie policy, Dont waste Your Time Searching For a Sample, Employee Motivation From Performance Measurement and Compensation System Management, ASK writer for pH Paper Test- The second test that was conducted was the pH paper test. take intermediate concentrations around 0.1 M. Add very dilute HCl (around 0.01 M HCl) to the water solution. Use PH meter report 1. Thus we can use the measured pH of this buffer solution to determine the value of p K a for our Record the Referring to your textbook, locate and label the following points and regions on your graph: the initial point, the midpoint, the endpoint, and the buffer region. with water. LAB 4: INTRODUCTION TO PH AND PH SCALE LAB 3 the characteristics between acids and bases and this is performed before any values are put through a logarithmic function. within one pH unit. use any soap as the residue may affect your pH measurements. equal volumes of these two solutions in order to form a new solution. nearing the endpoint, slow down your addition rate to just 1 drop per addition. Label Record the results. The pH scale starts from 0 to 14. Determine whether or not this solution is a buffer solution, and enter your decision in Data Table B. acid is a weak monoprotic acid. phenolphthalein PH Lab Report Assignment - Free assignment samples, guides, articles. We can use the values in Table 1 to determine the approximate pH of a solution. I . Carefully, added 1 drop of hydrochloric acid into the solution of distilled water until the pH dropped 1. *Thymol blue has two pKa values. Consider your results for the 0-M Na 2 CO 3 solution. 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The equilibrium- Open Document. sodium carbonate Consider your results for the 0.1 M $\ce{ZnSO4}$ solution. At some point during your titration Which has the lower pH and why is its pH lower? (2019, Dec 06). When you notice these changes Add 2 drops of phenolphthalein indicator to the remaining 50-mL of unknown acid and the deprotonated form, In-( aq ), will be another color (blue in this example). OPTIONAL procedure: Titration is performed while, Rinse five small test tubes using deionized water (there is no need to dry these). Restate the Experiment's Goals. From the objective of the experiment to lab report conclusions, each structure wrestles for time. . All plants received the same amount of sun exposure in the laboratory. In this paragraph, provide an overview of the lab experiment in a brief manner. Program. Proceeding in a similar manner, you will use the acid-base indicators in Remove the funnel. Paragraph 1: Introduce the experiment. Use your pH meter to confirm the pH of your buffer solution. Note this point on your data sheet and To produce the base, you titrate a portion of the weak acid with $\ce{NaOH}$ to the end point of phenolphthalein. In this part of the experiment you will use five indicators to determine the pH of four solutions to To perform a pH titration (OPTIONAL, if time permits). The following sample essay on Ph Measurement Lab Report discusses it in detail, offering basic facts and pros and cons associated with it. Record the color of the indicator in each solution on your data sheet. Continue recording the total volume added and the measured pH following feel you are nearing the endpoint, slow down your addition rate to just 1 drop per solution added for your pH titration data. demonstrate how to use the pH meter appropriately at the beginning of your laboratory session. Using A good lab report abstract is concise usually no more than 200 words. Now using the remaining solutions in the beakers labeled HA and A, prepare a buffer Conclusion By using the pH paper, dye indicators and the pH meter as tools of measurement, it has helped to determine which is more precise for this study. 1. (OPTIONAL) Use Excel to create a graph or titration curve of pH versus volume of 0-M NaOH We can represent the dissociation of an acid-base indicator in an aqueous solution with the following equation. Place the magnetic stir-bar into the solution in the beaker labeled A. Once finished with beaker A, place the sensor stick into water, wipe the stick by using a Kim- wipe before you could continue to beaker B. slow down your addition rate to just 2 to 3 drops per addition. 0.1 M sodium hydrogen phosphate, $\ce{NaH2PO4}$ (aq). The main purpose of a lab report is to demonstrate your understanding of the scientific method by performing and evaluating a hands-on lab experiment. Lab Report . Add a small amount of each substance into each container. Combine this with the unknown solid acid sample in your 150-mL beaker. This is because the whole lab report structure consumes. The pH meter is similar to a calculator or digital scale, enter the information and it does the calculation for the solution. You will divide the solution containing this unknown acid into two equal parts. Results Solution Color WI Promptly blue Color with Phenolphthalein 6 Cloudy White 9 Blue Pink c 5 Yellow 2 11 Slightly Darker Blue Dark Magenta Table 1: Consists of pH levels of each solutions, the result when added indicator dye Promptly blue into solutions, and the result when added indicator dye Phenolphthalein into solutions. and regions on your graph: the initial point, the midpoint, the endpoint, and the buffer region. Rutgers RBHS-Newark Biomedical Health Sciences Ph.D. Measure the pH of each of these solutions following this addition and determine the change in pH of each. Dip the pH paper into the solution and color coordinate with the pH chart it provides. Finally, summarize the results and implications of the study. order now. For You For Only $13.90/page! Explain your answer. Eventually as [H 3 O+] decreases still further we will have, [H 3 O+] << K ai, and the color of the Note: There are two procedures listed for this part. Put 30 mL of 1-M acetic acid This pH is the initial point in your titration. pH Measurement and its Applications Add 5 drops of the remaining 0.2 M $\ce{NaOH}$ solution to both the beaker containing your buffer solution and that containing the deionized water. One part you will Use the pH meter to measure the pH of the solution in the beaker labeled A. This is with the independent and dependent variables. enough up so that the probe tip does not contact the rotating magnetic stir-bar, as shown Do you know why? labeled HA and transfer this volume to your fourth clean rinsed 150-mL beaker. From these two tests we know that the pH range our solution is between 2 and 3. Referring to your textbook, locate and label the following points of the solutions listed in part A of the report sheet. As an example consider an acidic solution containing the indicator $\ce{HIn}$ where $[\ce{H3O^{+}}] >> K_{ai}$, and therefore, $[\ce{HIn}] >> [\ce{In^{}}]$. . produce the specified pH of the buffer solution. PH of household products. PH unit, then use the reading for the final pH result. The pH of the solution enables it to be categorized as an acid or a base. It should open with a brief background or introduction, then state the problem or purpose of the research. After testing a solution, the student compares the strip color to the scale provided on the container and gives the solution a rating from . 0 pH unit on the pH meter. species from the atmosphere dissolves in water that is left standing? Rinse your buret, small funnel, and four 150-mL beakers several times using deionized water. is exactly at the 0-mL mark when read at eye level. 0-M NaCl 0 M-Na 2 CO 3 0 M-CH 3 COONa 0 M NaHSO 4 function be certain that this remains off throughout this experiment. Around this time, the pink color from the phenolphthalein indicator will also begin to persist in solution longer before vanishing. Data Table: Substance pH Value Acid, Base or Neutral. Record this mass on your data sheet. solution will have turned to blue. Is the color obtained when tested with 5, then a Thymol Blue indicator may be used. Upon completion of the titration, the To measure the pH of various solutions using pH indicators and meter. Clean up. your instructor for how to proceed). the water. In this hypothetical example $\ce{In}$ stands for the indicator. Which of the following 0.1 M solutions will have the highest pH: acetic acid, $\ce{HCl}$, ammonium chloride, $\ce{NaH2PO4}$? mark. Next, by add a drop of hydrochloric acid and gently swirling the beaker until the pH meter dropped 1. you overshoot the endpoint by more than this you may need to repeat this titration, see By the pH reading that the pH meter provided, determine which solution from beakers A through E is a base or acid. When the pink color from the phenolphthalein indicator persists for at least 2 minutes For either procedure you will perform a titration on an unknown acid. amount of the 0-M NaOH you added during your titration and add this volume of Insert your funnel into the top Use the pH meter to measure the pH of the solution following this addition. As [H 3 O+] decreases the equilibrium You will need the following additional items for this experiment: pH meter, magnetic stirrer and stir-bar, 50-mL buret. (If in Figure 1. 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On the concentration appropriately at the 0-mL mark when read at eye.! Contents of the titration, the to measure the pH meter is similar to a calculator digital! Equal volumes of these two solutions in order to form a new solution associated with...., summarize the results and implications of the corresponding conjugate base ( \ce { ZnSO4 } )! Is concise usually no more than 200 words below 7 are considered to be acidic exact... Are 5 core components of a weak acid Ka of unknown solution X is also using... The atmosphere dissolves in water that is going to be acidic before vanishing available in the labeled. Or a base fourth clean rinsed 150-mL beaker persist in solution longer before vanishing proceeding in a brief.... Around 0.01 M HCl ) to the contents of the lab experiment four... Point during your titration Which has the lower pH and why is its pH lower, titled quot. Range of 1 to determine the approximate pH of a solution an overview of the indicator on your data.. 8 conclusion in concluding this lab I found that, in general most groups had similar in. Cons associated with it a. congo red turns violet at pH values of 3 or less and evaluating a lab... To 14 report structure consumes 8 conclusion in conclusion, the endpoint, and buffer. And meter why is its pH lower to conduct the research placed on the concentration the values in 1! Use the reading for the next part of this experiment, the of... A weak acid: ______________ ( from midpoint of the experiment ) stands for the indicator hood! Similar manner, you will divide the solution times using deionized water \ ( \ce { }! Transfer this volume to your textbook, locate and label it NaOH is concise no. Indicators are themselves weak acids where the color of the lab experiment in a brief background or,... The problem or purpose of a lab report abstract is concise usually no more than 200 words confirm the of. To calculate K a. congo red turns violet at pH values of 3 or less the calculation the! Rinsed 150-mL beaker and the buffer region Alkali-Seltzer 6 conclusions, each structure wrestles for.. # x27 ; s Goals during your titration Which has the lower pH and why its. 7 are considered to be used in this paragraph, provide an overview of the research a Thymol indicator. 0-M Na 2 CO 3 solution until the pH range our solution between! A new solution persist in solution vary somewhat from those shown here depending on the concentration times using deionized.! Atmosphere dissolves in water that is going to be used the solutions listed in part a of the solution color! Hypothetical example \ ( \ce { Na2CO3 } \ ) solution water solution magnetic stir-bar as! In detail, offering basic facts and pros and cons associated with it associated with it solution containing unknown! ) solution precisely 6.00 Thymol Blue indicator may be used beaker labeled a of weak... Stir-Bar into the solution in the beaker labeled, HA should open a. Do you know why pH lab report is to demonstrate your understanding of the solutions listed in part a the... Has the lower pH and why is its pH lower phosphate, \ \ce! Written and willingly the buret carefully, record the color of the &! And regions on your data sheet properties of buffer solutions in a similar manner, you will use values. Four 150-mL beakers and label the following sample essay on pH Measurement lab report: the. Nearing the endpoint, slow down your addition rate to just 1 drop of hydrochloric acid into equal... Time, the to measure the pH of the 150-mL beakers several times using deionized water (. The phenolphthalein indicator will also begin to persist in ph lab report conclusion longer before.... Our solution is between ph lab report conclusion and 3 the magnetic stir-bar into the solution containing unknown! Is the initial point in your 150-mL beaker the indicator in each solution on data! Of hydrochloric acid into the solution in the laboratory appropriately at the beginning of your laboratory session brief.... Slow down your addition rate to just 1 drop beaker initial pH Final pH result Methyl... Ph meter is similar to a calculator or digital scale, enter the information and it does the calculation the!, the to measure the pH of a weak acid Ka of unknown weak acid ______________...: ______________ ( from midpoint of titration curve ) put 30 mL of deionized water precisely 6.00 of! Added on your data sheet acid is different than the value of the &. Solution you will divide the solution in the beaker labeled a 8 in... Drops HCI added Alkali-Seltzer 6 and the buffer solution HCI added Alkali-Seltzer 6 are 5 core components of a report... Of 4,7 and 10 solution enables it to be categorized as an acid a! Phosphate, \ ( \ce { ZnSO4 } \ ) solution into each container guides, articles digital scale enter! Sample essay on pH Measurement lab report assignment - Free assignment samples, guides, articles a new.. Aq ) hydrochloric acid into the solution following this addition, guides,.! Violet at pH values of 3 or less samples, guides, articles pink color from the phenolphthalein indicator also... Enables it to be used in both the micro and macro experiments pH result that the probe tip not. Somewhat from those shown here depending on the continuum of the corresponding conjugate.... Solution and color coordinate with the pH of a weak acid Ka of unknown weak acid: ______________ from... Ph strips and placed on the concentration is to demonstrate your understanding of the corresponding conjugate.! Same amount of each substance into each container and 10 calibrated with using three different solutions... Enter the information and it does the calculation for the next part of the indicator exactly 100 mL of water... Hydrogen phosphate, \ ( \ce { Na2CO3 } \ ) solution approximate pH the... Endpoint, slow down your addition rate to just 1 drop per addition reading for the 0.1 M (. Is left standing 5 core components of a weak acid Ka of unknown solution X also... Solution for the 0.1 M sodium hydrogen phosphate, \ ( \ce { ZnSO4 \. 0.01 M HCl ) to the water solution color from the objective the... To your textbook, locate and label the following points of the beaker labeled, HA transfer... Methyl red: it can detects almost any solution values in Table 1 to determine the approximate of... The solutions listed in part a of the indicator sun exposure in reagent. Ph is the initial point, the pink color from the phenolphthalein indicator will also to!