ilibria re (C,H5COOH) and any amount you need of sodium benzo- ate (CH5COONA). (a) What is the pH of the benzoic acid solution prior to adding sodium benzoate? (b) How many grams of sodium benzoate should be added to prepare the buffer? Neglect the small volume change that occurs when t. mmo- ade by 0.20 M t. i pH of ONa) nat is ium oт- L of the sodium benzoate is added. 17.27 A buffer contains 0.10 mol of acetic acid and 0.13 mol of sodium acetate in 1.00 L. (a) What is the pH of this buffer? (b) What is the pH of the buffer after the addition of 0.02 mol of KOH? (c) What is the pH of the buffer after the addi- 17.35 tion of 0.02 mol of HNO3? 17.28 A buffer contains 0.15 mol of propionic acid (C2H5COOH) and 0.10 mol of sodium propionate (C2H5COONa) in 1.20L. (a) What is the pH of this buffer? (b) What is the pH of the buffer after the addition of 0.01 mol of NaOH? (c) What is the pH of the buffer after the addition of 0.01 mol of HI2 oic za- ng id of 17.29 (a) What is the ratio of HCO3 to H2CO3 in blood of pH 7 42 (b) What is the ratio of HCO3 to H2CO3 in an exhausted marathon runner whose blood pH is 7.1? 17.30 A buffer, consisting of H2PO4 and HPO,2-, helps control the pH of physiological fluids. Many carbonated soft drinks also use this buffer system. What is the pH of a soft drink in which the major buffer ingredients are 6.5 g of NaH2PO4 and 8.0 g of Na HPO4 per 355 mL of solution? 17.31 You have to prepare a pH = 3.50 buffer, and you have the v following 0.10 M solutions available: HCOOH, CH3COOH, H3PO4, HCOONa, CH3COONA, and NaH,PO4. Which solu- tions would you use? How many milliliters of each solution would you use to make approximately 1 L of the buffer? 25.0 ml %3D 17.32 You have to prepare a pH = 5.00 buffer, and you have the following 0.10 M solutions available: HCOOH, HCOONG; CH3COOH, CH;COONA, HCN, and NaCN. Which solu- tions would you use? How many milliliters of each solution would you use to make approximately 1 L of the buffer? 17.36 Acid-Base Titrations (Section 17 1)
ilibria re (C,H5COOH) and any amount you need of sodium benzo- ate (CH5COONA). (a) What is the pH of the benzoic acid solution prior to adding sodium benzoate? (b) How many grams of sodium benzoate should be added to prepare the buffer? Neglect the small volume change that occurs when t. mmo- ade by 0.20 M t. i pH of ONa) nat is ium oт- L of the sodium benzoate is added. 17.27 A buffer contains 0.10 mol of acetic acid and 0.13 mol of sodium acetate in 1.00 L. (a) What is the pH of this buffer? (b) What is the pH of the buffer after the addition of 0.02 mol of KOH? (c) What is the pH of the buffer after the addi- 17.35 tion of 0.02 mol of HNO3? 17.28 A buffer contains 0.15 mol of propionic acid (C2H5COOH) and 0.10 mol of sodium propionate (C2H5COONa) in 1.20L. (a) What is the pH of this buffer? (b) What is the pH of the buffer after the addition of 0.01 mol of NaOH? (c) What is the pH of the buffer after the addition of 0.01 mol of HI2 oic za- ng id of 17.29 (a) What is the ratio of HCO3 to H2CO3 in blood of pH 7 42 (b) What is the ratio of HCO3 to H2CO3 in an exhausted marathon runner whose blood pH is 7.1? 17.30 A buffer, consisting of H2PO4 and HPO,2-, helps control the pH of physiological fluids. Many carbonated soft drinks also use this buffer system. What is the pH of a soft drink in which the major buffer ingredients are 6.5 g of NaH2PO4 and 8.0 g of Na HPO4 per 355 mL of solution? 17.31 You have to prepare a pH = 3.50 buffer, and you have the v following 0.10 M solutions available: HCOOH, CH3COOH, H3PO4, HCOONa, CH3COONA, and NaH,PO4. Which solu- tions would you use? How many milliliters of each solution would you use to make approximately 1 L of the buffer? 25.0 ml %3D 17.32 You have to prepare a pH = 5.00 buffer, and you have the following 0.10 M solutions available: HCOOH, HCOONG; CH3COOH, CH;COONA, HCN, and NaCN. Which solu- tions would you use? How many milliliters of each solution would you use to make approximately 1 L of the buffer? 17.36 Acid-Base Titrations (Section 17 1)
Chemistry & Chemical Reactivity
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Chapter16: Principles Of Chemical Reactivity: The Chemistry Of Acids And Bases
Section: Chapter Questions
Problem 116IL: Amino acids are an important group of compounds. At low pH, both the carboxylic acid group (CO2H)...
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17.28 (a) use H-H equation
Transcribed Image Text:ilibria
re
(C,H5COOH) and any amount you need of sodium benzo-
ate (CH5COONA). (a) What is the pH of the benzoic acid
solution prior to adding sodium benzoate? (b) How many
grams of sodium benzoate should be added to prepare the
buffer? Neglect the small volume change that occurs when
t.
mmo-
ade by
0.20 M
t.
i
pH of
ONa)
nat is
ium
oт-
L of
the sodium benzoate is added.
17.27 A buffer contains 0.10 mol of acetic acid and 0.13 mol of
sodium acetate in 1.00 L. (a) What is the pH of this buffer?
(b) What is the pH of the buffer after the addition of 0.02
mol of KOH? (c) What is the pH of the buffer after the addi-
17.35
tion of 0.02 mol of HNO3?
17.28 A buffer contains 0.15 mol of propionic acid (C2H5COOH)
and 0.10 mol of sodium propionate (C2H5COONa) in 1.20L.
(a) What is the pH of this buffer? (b) What is the pH of the
buffer after the addition of 0.01 mol of NaOH? (c) What is
the pH of the buffer after the addition of 0.01 mol of HI2
oic
za-
ng
id
of
17.29 (a) What is the ratio of HCO3 to H2CO3 in blood of pH 7 42
(b) What is the ratio of HCO3 to H2CO3 in an exhausted
marathon runner whose blood pH is 7.1?
17.30 A buffer, consisting of H2PO4 and HPO,2-, helps control
the pH of physiological fluids. Many carbonated soft drinks
also use this buffer system. What is the pH of a soft drink
in which the major buffer ingredients are 6.5 g of NaH2PO4
and 8.0 g of Na HPO4 per 355 mL of solution?
17.31 You have to prepare a pH = 3.50 buffer, and you have the
v following 0.10 M solutions available: HCOOH, CH3COOH,
H3PO4, HCOONa, CH3COONA, and NaH,PO4. Which solu-
tions would you use? How many milliliters of each solution
would you use to make approximately 1 L of the buffer?
25.0 ml
%3D
17.32 You have to prepare a pH = 5.00 buffer, and you have the
following 0.10 M solutions available: HCOOH, HCOONG;
CH3COOH, CH;COONA, HCN, and NaCN. Which solu-
tions would you use? How many milliliters of each solution
would you use to make approximately 1 L of the buffer?
17.36
Acid-Base Titrations (Section 17 1)
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