Compare the size of the change in pH value when HCl and NaOH are added to water vs. the size of the change in pH value for the standard reference buffer. Explain why the change for water vs. buffer was the same or different in size. Which household substances behaved as buffers? Briefly explain your reasoning. Study the Lewis structure of a generic amino acid shown below. Identify the part of a generic amino acid that reacts
Compare the size of the change in pH value when HCl and NaOH are added to water vs. the size of the change in pH value for the standard reference buffer. Explain why the change for water vs. buffer was the same or different in size. Which household substances behaved as buffers? Briefly explain your reasoning. Study the Lewis structure of a generic amino acid shown below. Identify the part of a generic amino acid that reacts
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter15: Additional Aqueous Equilibria
Section: Chapter Questions
Problem 93QRT: When 40.00 mL of a weak monoprotic acid solution is titrated with 0.100-M NaOH, the equivalence...
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Question
- Compare the size of the change in pH value when HCl and NaOH are added to water vs. the size of the change in pH value for the standard reference buffer. Explain why the change for water vs. buffer was the same or different in size.
- Which household substances behaved as buffers? Briefly explain your reasoning.
- Study the Lewis structure of a generic amino acid shown below. Identify the part of a generic amino acid that reacts with base and the part that reacts with acid. Briefly explain your answer. Hint: Draw Lewis structures for ammonia (NH 3) and acetic acid (CH 3COOH).
Transcribed Image Text:H2N-C-COOH
H
generic amino acid
Transcribed Image Text:Table 1. Changes in pH of test solutions after reacting with strong acid or strong base.
Test solution
Initial pH
pH after HCl added
pH after NaOH added
Water
8.25
2.92
11.86
Buffer
7.01
7.06
7.27
Part B. Household Substances as Buffers
Table 2. Changes in pH of household substances after reacting with strong acid or strong
base.
Test solution
Initial pH
pH after HCl added
pH after NaOH added
Distilled water
4
11
Club soda
5
Egg albumin
8
10
Table salt
4
3
10
Baking soda
8
8
9
Sugar
4
2
11
3.
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