Chemistry: Principles and Practice
3rd Edition
ISBN: 9780534420123
Author: Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher: Cengage Learning
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Chapter 16, Problem 16.61QE
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A 30.0-mL sample of 0.165 Mpropanoic acid (CH3CH2COOH, Ka = 1.3 × 10−5) is titrated with 0.300 MKOH.
a)Calculate the initial pH of the solution in the titration flask.
b)Complete and balance the titration reaction. Be sure to include physical states.
c)Determine the volume of potassium hydroxide it takes to reach equivalence point in the titration.
d)Choose a volume (in mL) of potassium hydroxide added that is 2-9 mL of titrant added before the equivalence point and calculate the pH at this volume. VKOH added = _________ mL
e)Calculate the pH at the equivalence point.
1)A 30.0-mL sample of 0.165 Mpropanoic acid (CH3CH2COOH, Ka = 1.3 × 10−5) is titrated with 0.300 MKOH.
a)Calculate the initial pH of the solution in the titration flask.
b)Complete and balance the titration reaction. Be sure to include physical states.
c)Determine the volume of potassium hydroxide it takes to reach equivalence point in the titration.
A student obtains a sample of 0.02500 M acetic acid (CH3COOH, 60.05 g/mole, Ka =1.8 x 10-5). 50.00 mL of the acid sample is then analyzed by titration against 0.05000 M NaOH.
Calculate the pH at the ½ equivalence point.Calculate the pH at the equivalence point.Calculate the pH after 1.00 mL of NaOH has been added beyond the equivalence point.
Chapter 16 Solutions
Chemistry: Principles and Practice
Ch. 16 - Prob. 16.1QECh. 16 -
Sketch a titration curve for the titration of...Ch. 16 - Prob. 16.4QECh. 16 - Prob. 16.5QECh. 16 - Explain why the HendersonHasselbalch equation...Ch. 16 - Prob. 16.7QECh. 16 - Prob. 16.8QECh. 16 - Prob. 16.9QECh. 16 - Prob. 16.11QECh. 16 - Prob. 16.13QE
Ch. 16 - Prob. 16.14QECh. 16 - Prob. 16.15QECh. 16 - Prob. 16.16QECh. 16 - Prob. 16.17QECh. 16 - Prob. 16.18QECh. 16 - Calculate the pH during the titration of 100.0 mL...Ch. 16 - Prob. 16.20QECh. 16 - Prob. 16.21QECh. 16 - Calculate the pH during the titration of 50.00 mL...Ch. 16 - Prob. 16.23QECh. 16 - Calculate the pH during the titration of 50.00 mL...Ch. 16 - Prob. 16.25QECh. 16 - Prob. 16.26QECh. 16 - Prob. 16.27QECh. 16 - Prob. 16.28QECh. 16 -
Calculate the pH of solutions that are
0.25 M...Ch. 16 - Prob. 16.30QECh. 16 - Prob. 16.31QECh. 16 - Prob. 16.32QECh. 16 - Prob. 16.35QECh. 16 - Prob. 16.36QECh. 16 - Prob. 16.37QECh. 16 - Prob. 16.38QECh. 16 - Prob. 16.39QECh. 16 -
How many grams of sodium acetate must be added to...Ch. 16 - Prob. 16.41QECh. 16 - Prob. 16.42QECh. 16 - A buffer solution that is 0.100 M acetate ion and...Ch. 16 - Prob. 16.44QECh. 16 - Prob. 16.45QECh. 16 - Prob. 16.46QECh. 16 - Prob. 16.47QECh. 16 - Prob. 16.48QECh. 16 - Estimate the pH that results when the following...Ch. 16 - Estimate the pH that results when the following...Ch. 16 - Prob. 16.51QECh. 16 - Prob. 16.52QECh. 16 - Prob. 16.53QECh. 16 - Prob. 16.54QECh. 16 - Prob. 16.55QECh. 16 - Prob. 16.56QECh. 16 - Prob. 16.57QECh. 16 - Prob. 16.58QECh. 16 - Prob. 16.59QECh. 16 - Consider all acid-base indicators discussed in...Ch. 16 - Prob. 16.61QECh. 16 - Chloropropionic acid, ClCH2CH2COOH, is a weak...Ch. 16 - Prob. 16.63QECh. 16 - Prob. 16.64QECh. 16 - Prob. 16.65QECh. 16 - Write the chemical equilibrium and expression for...Ch. 16 - Calculate the pH of 0.010 M ascorbic acid.Ch. 16 - Prob. 16.68QECh. 16 - Prob. 16.69QECh. 16 - Prob. 16.70QECh. 16 - Prob. 16.71QECh. 16 - Prob. 16.72QECh. 16 - Prob. 16.73QECh. 16 - Prob. 16.74QECh. 16 - Prob. 16.75QECh. 16 - Which compound in each pair is more soluble in...Ch. 16 - Prob. 16.77QECh. 16 - Prob. 16.78QECh. 16 - Prob. 16.79QECh. 16 - Calculate the pH of each of the following...Ch. 16 - Write the chemical equation and the expression for...Ch. 16 - Prob. 16.82QECh. 16 - Prob. 16.83QECh. 16 - Phenolphthalein is a commonly used indicator that...Ch. 16 - Prob. 16.85QECh. 16 - Prob. 16.86QECh. 16 - Prob. 16.87QECh. 16 - Determine the dominant acid-base equilibrium that...Ch. 16 - Prob. 16.89QECh. 16 - Prob. 16.90QECh. 16 - Prob. 16.91QECh. 16 - Prob. 16.92QECh. 16 - Prob. 16.93QECh. 16 - Prob. 16.94QECh. 16 - Prob. 16.95QECh. 16 - Prob. 16.96QECh. 16 - Prob. 16.97QECh. 16 - A monoprotic organic acid that has a molar mass of...Ch. 16 - A scientist has synthesized a diprotic organic...Ch. 16 - Prob. 16.100QECh. 16 - What is a good indicator to use in the titration...Ch. 16 - Prob. 16.102QECh. 16 - A bottle of concentrated hydroiodic acid is 57% HI...
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- You are given the following acidbase titration data, where each point on the graph represents the pH after adding a given volume of titrant (the substance being added during the titration). a What substance is being titrated, a strong acid, strong base, weak acid, or weak base? b What is the pH at the equivalence point of the tiration? c What indicator might you use to perform this titration? Explain.arrow_forwardThe titration curves for two acids with the same base are shown on this graph. (a) Which is the curve for the weaker acid? Explain your choice. (b) Give the approximate pH at the equivalence point for the titration of each acid. (c) Explain why the pH at the equivalence point differs for each acid. (d) Explain why the starting pH values of the two acids differ. (e) Which indicator or indicators, phenolphthalein, bromthymol blue, or methyl red, could be used for the titration of Acid 1? For the titration of Acid 2? Explain your choices.arrow_forwardKa for formic acid is 1.7 104 at 25C. A buffer is made by mixing 529 mL of 0.465 M formic acid, HCHO2, and 494 mL of 0.524 M sodium formate, NaCHO2. Calculate the pH of this solution at 25C after 110 mL of 0.152 M HCl has been added to this buffer.arrow_forward
- Using Figure 17.11, suggest an indicator to use in each of the following titrations: (a) The weak base pyridine is titrated with HCl. (b) Formic acid is titrated with NaOH. (c) Ethylenediamine, a weak diprotic base, is titrated with HCl. Figure 17.11 Common acid-base indicators. The color changes occur over a range of pH values. Notice that o few indicators hove color changes over two different pH ranges.arrow_forwardConsider all acid-base indicators discussed in this chapter. Which of these indicators would be suitable for the titration of (a) NaOH with HClO4. (b) acetic acid with KOH. (c) NH3 solution with HBr. (d) KOH with HNO3. Explain your choices.arrow_forwardWhich of the acid-base indicators discussed in this chapter would be suitable for the titration of (a) HNO3 with KOH. (b) KOH with acetic acid. (c) HCl with NH3. (d) KOH with HNO2. Explain your answers.arrow_forward
- When a diprotic acid, H2A, is titrated with NaOH, the protons on the diprotic acid are generally removed one at a time, resulting in a pH curve that has the following generic shape: a. Notice that the plot has essentially two titration curves. If the first equivalence point occurs at 100.0 mL NaOH added, what volume of NaOH added corresponds to the second equivalence point? b. For the following volumes of NaOH added, list the major species present after the OH reacts completely. i. 0 mL NaOH added ii. between 0 and 100.0 mL NaOH added iii. 100.0 mL NaOH added iv. between 100.0 and 200.0 mL NaOH added v. 200.0 mL NaOH added vi. after 200.0 mL NaOH added c. If the pH at 50.0 mL NaOH added is 4.0, and the pH at 150.0 mL NaOH added is 8.0, determine the values Ka1, and Ka2 for the diprotic acid.arrow_forwardConsider the nanoscale-level representations for Question 110 of the titration of the aqueous weak acid HX with aqueous NaOH, the titrant. Water molecules and Na+ ions are omitted for clarity. Which diagram corresponds to the situation: After a very small volume of titrant has been added to the initial HX solution? When enough titrant has been added to take the solution just past the equivalence point? Halfway to the equivalence point? At the equivalence point? Nanoscale representations for Question 110.arrow_forwardBriefly describe how a buffer solution can control the pH of a solution when strong acid is added and when strong base is added. Use NH3/NH4Cl as an example of a buffer and HCl and NaOH as the strong acid and strong base.arrow_forward
- a Draw a pH titration curve that represents the titration of 25.0 mL of 0.15 M propionic acid. CH3CH2COOH, by the addition of 0.15 M KOH from a buret. Label the axes and put a scale on each axis. Show where the equivalence point and the buffer region are on the titration curve. You should do calculations for the 0%, 50%, 60%, and 100% titration points. b Is the solution neutral, acidic, or basic at the equivalence point? Why?arrow_forwardAniline hydrochloride, (C6H5NH3)Cl, is a weak acid. (Its conjugate base is the weak base aniline, C6H5NH2.) The acid can be titrated with a strong base such as NaOH. C6H5NH3+(aq)+OH(aq)C6H5NH2(aq)+H2O(l) Assume 50.0 mL of 0.100 M aniline hydrochloride is titrated with 0.185 M NaOH. (Ka for aniline hydrochloride is 2.4 105.) (a) What is the pH of the (C6H5NH3) solution before the titration begins? (b) What is the pH at the equivalence point? (c) What is the pH at the halfway point of the titration? (d) Which indicator in Figure 17.11 could be used to detect the equivalence point? (e) Calculate the pH of the solution after adding 10.0, 20.0, and 30.0 mL of base. (f) Combine the information in parts (a), (b), (c), and (e), and plot an approximate titration curve.arrow_forwardCalculate the pH change when 10.0 mL of 0.100-M NaOH is added to 90.0 mL pure water, and compare the pH change with that when the same amount of NaOH solution is added to 90.0 mL of a buffer consisting of 1.00-M NH3 and 1.00-M NH4Cl. Assume that the volumes are additive. Kb of NH3 = 1.8 × 10-5.arrow_forward
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Acid-Base Titration | Acids, Bases & Alkalis | Chemistry | FuseSchool; Author: FuseSchool - Global Education;https://www.youtube.com/watch?v=yFqx6_Y6c2M;License: Standard YouTube License, CC-BY