15.) a.) In the laboratory, a general chemistry student measured the pH of a 0.3

Question

15.) a.)In the laboratory, a general chemistry student measured the pH of a 0.376 M aqueous solution of nitrous acid to be 1.872.

Use the information she obtained to determine the Ka for this acid.

Ka(experiment) =

b.)In the laboratory, a general chemistry student measured the pH of a 0.376 M aqueous solution of nitrous acid to be 1.870.

Use the information she obtained to determine the Ka for this acid.

Ka(experiment) =

c.)In the laboratory, a general chemistry student measured the pH of a 0.376 M aqueous solution of hydrocyanic acid to be 4.928.

Use the information she obtained to determine the Ka for this acid.

Ka(experiment) =

Explanation / Answer

pH = 1.872

[H+] = x = 0.0134 M

a)

HNO2 ------------------------> H+ + NO2-

0.376                                   0         0 --------------->initial

0.376 -x                                x        x ---------------> equilibrium

Ka = x^2 / 0.376-x

Ka = 0.0134^2 / 0.376 - 0.0134

Ka = 4.79 x 10^-4

b.)

[H+] = 0.0135 = x

Ka = 5.02 x 10^-4

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