Question 3 What must be the minimum concentration of cyanoacetic acid in 1.00L buffer solution of a pH 2.07 cyanoacetic acid/sodium cyanoacetate buffer if the pH changes by 0.20 units when 0.072 moles HCl are added? Click here for the table of lonization Constants of Weak Acids.

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
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Chapter15: Additional Aqueous Equilibria
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Question 3
What must be the minimum concentration of cyanoacetic acid in 1.00L
buffer solution of a pH 2.07 cyanoacetic acid/sodium cyanoacetate buffer
if the pH changes by 0.20 units when 0.072 moles HCl are added? Click
here for the table of lonization Constants of Weak Acids.
Transcribed Image Text:Question 3 What must be the minimum concentration of cyanoacetic acid in 1.00L buffer solution of a pH 2.07 cyanoacetic acid/sodium cyanoacetate buffer if the pH changes by 0.20 units when 0.072 moles HCl are added? Click here for the table of lonization Constants of Weak Acids.
lonization Constants of Weak Acids at 25°C
Name of Acid
Ка
pKa
Salt
Acetic
CH3COOH
1.78E-05
4.75
acetate
Cyanoacetic
NCCH,COOH
3.50E-03
2.46
cyanoacetate
Dichloroacetic
CI2CHCOOH
5.50E-02
1.26
dichloroacetate
Hydrocyanic
HCN
6.20E-10
9.21
cyanide
Нурochlorous
HOCI
2.90E-08
7.54
hypochlorite
Нуpoiodous
HOI
2.30E-11
10.64
hypoiodite
Нуpobromous
HOBR
2.50E-09
8.60
hypobromite
Transcribed Image Text:lonization Constants of Weak Acids at 25°C Name of Acid Ка pKa Salt Acetic CH3COOH 1.78E-05 4.75 acetate Cyanoacetic NCCH,COOH 3.50E-03 2.46 cyanoacetate Dichloroacetic CI2CHCOOH 5.50E-02 1.26 dichloroacetate Hydrocyanic HCN 6.20E-10 9.21 cyanide Нурochlorous HOCI 2.90E-08 7.54 hypochlorite Нуpoiodous HOI 2.30E-11 10.64 hypoiodite Нуpobromous HOBR 2.50E-09 8.60 hypobromite
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