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In the laboratory, a general chemistry student measured the pH of a 0.414 M aqueous solution of Use the information she obtai

In the laboratory, a general chemistry student measured the pH of a 0.414 M aqueous solution of Use the information she obtai

In the laboratory, a general chemistry student measured the pH of a 0.591 M aqueous solution of acetic acid to be 2.504 Use t

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Answer 1

Answer #1

1)

use:

pH = -log [H+]

2.581 = -log [H+]

[H+] = 2.624*10^-3 M

HA dissociates as:

HA -----> H+ + A-

0.414 0 0

0.414-x x x

Ka = [H+][A-]/[HA]

Ka = x*x/(c-x)

Ka = 2.624*10^-3*2.624*10^-3/(0.414-2.624*10^-3)

Ka = 1.674*10^-5

Answer: 1.67*10^-5

2)

use:

pH = -log [H+]

2.504 = -log [H+]

[H+] = 3.133*10^-3 M

HA dissociates as:

HA -----> H+ + A-

0.591 0 0

0.591-x x x

Ka = [H+][A-]/[HA]

Ka = x*x/(c-x)

Ka = 3.133*10^-3*3.133*10^-3/(0.591-3.133*10^-3)

Ka = 1.67*10^-5

Answer: 1.67*10^-5

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