Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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-Calculate the molarity of the acetic acid solution in Figure 16B.1 if 25.0
mL of that solution has been titrated with the 0.101 M solution of NaOH
-Estimate the mass of KHP that will require 25 mL of 0.10 M NaOH to
reach the equivalence point in a titration. Give the chemical equation for the reaction.
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- A chemistry graduate student is given 300. mL of a 0.90M ammonia (NH,) solution. Ammonia is a weak base with K,=1.8 × 10 ° 5 What mass of NH,Br should the student dissolve in the NH, solution to turn it into a buffer with pH = 8.92? %3D You may assume that the volume of the solution doesn't change when the NH,Br is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits. x10arrow_forwardAn analytical chemist is titrating 64.9 mL of a 0.5800M solution of isopropylamine ((CH3),CHNH2) with a 0.3400M solution of HNO3. The p K, of isopropylamine is 3.33. Calculate the pH of the base solution after the chemist has added 69.8 mL of the HNO, solution to it. Note for advanced students: you may assume the final volume equals the initial volume of the solution plus the volume of HNO,3 solution added. Round your answer to 2 decimal places. pH =arrow_forwardA buffer solution contains 0.396MCH, NH, Br and 0.266MCH, NH, (methylamine). Determine the pH change when 0.063mol NaOH is added to 1.00% of the buffer. pH after addition -pH before addition pH change = A buffer solution contains 0.396 M CH3NH3Br and 0.266 M CH3NH2 (methylamine). Determine the pH change when 0.063 mol NaOH is added to 1.00 L of the buffer. pH after addition - pH before addition = pH change: =arrow_forward
- Determine the mass of solid NaCH₃COO that must be dissolved in an existing 500.0 mL solution of 0.200 M CH₃COOH to form a buffer with a pH equal to 5.00. The value of Ka for CH₃COOH is 1.8 × 10⁻⁵. Based on the information provided, set up a RICE/ICE Table to answer the question. Let x represent the original concentration of CH₃COOH in the water.arrow_forward4) a) Determine the mass (in grams) of sodium formate that must be added to 1.00 L of 0.180 M formic acid to prepare a buffer with a pH = 3.50. Assume there is no change in volume upon addition of the sodium formate. b) Write the predominant chemical reaction that occurs when 0.050 mol of HClO4 is added to 1.00 L of the buffer prepared in part a and calculate the pH of the solution.arrow_forwardGW 18b 1. A 20.0 mL sample of a 0.240 M hydrofluoric acid (HF) solution is titrated with 0.200 M NaOH. Determine: (a) pH of the acid solution before any base is added; (b) volume (in mL) of base needed to get to the equivalence point; (c) pH halfway to equivalence point; (d) pH at equivalence point; (e) pH when 0.100 mL NaOH is added beyond the equivalence point. (K₂ of HF = 7.1 × 104)arrow_forward
- A solution of a weak acid is titrated with a standard solution of a strong base. The progress of the titration is followed with a pH meter. Which of the following observations best describes what would occur? Initially the pH of the solution increases slowly, and then it increases much more rapidly, before increasing slowly again At the equivalence point, the pH is 7 The pH of the solution gradually decreases throughout the experiment After the equivalence point, the pH becomes constant because this is the bufferarrow_forwardIn Part A, a 15.00 mL aliquot of a 0.155 mol L-1 3-methylbutanoic acid solution was titrated to its equivalence point with 11.7 mL of 0.198 molL-1 NaOH solution. At the equivalence point, all of the weak acid, 3-methylbutanoic acid, is converted to its weak conjugate base, 3-methylbutanoate. What is the pH at this equivalence point? 6.957 4.770 8.855 5.145 O 9.230arrow_forwardDescribe the pH changes that occur during the titration of a weak base by a strong acid. What is meant by the term equivalence point?arrow_forward
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