Problem 16.63 Calculate the percent ionization of hydrazoic acid (HN3) in soluti

Question

Problem 16.63

Calculate the percent ionization of hydrazoic acid (HN3) in solutions of each of the following concentrations (Ka is given in Appendix D in the textbook).

Part A

0.374M .

Express your answer using two significant figures.

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Correct

Part B

0.113M .

Express your answer using two significant figures.

0.71

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Incorrect; Try Again; 3 attempts remaining

Part C

4.30

Problem 16.63

Calculate the percent ionization of hydrazoic acid (HN3) in solutions of each of the following concentrations (Ka is given in Appendix D in the textbook).

Part A

0.374M .

Express your answer using two significant figures.

SubmitHintsMy AnswersGive UpReview Part

Correct

Part B

0.113M .

Express your answer using two significant figures.

0.71

SubmitHintsMy AnswersGive UpReview Part

Incorrect; Try Again; 3 attempts remaining

Part C

4.30

Explanation / Answer

HN3 ----> H+ + N3-

0.374 - X...X.....X

pKa for HN3 = 4.6

Ka = 10^-pKa = 2.5 x 10^-5

2.5 x 10^-5 = X^2 / 0.374 - X

=> X = 3.06 x 10^-3 M

% ionization = X * 100 / Inital conc. of HN3 = 3.06 x 10^-3 x 100 / 0.374 = 0.82 %

B)

HN3 ----> H+ + N3-

0.113 - X...X.....X

Ka = 2.5 x 10^-5 = X^2 / 0.113 - X

=> X = 1.68 x 10^-3 M

% ionization = X * 100 / Inital conc. of HN3 = 1.68 x 10^-3 x 100 / 0.113 = 1.49 %

C)

HN3 ----> H+ + N3-

0.043 - X...X.....X

Ka = 2.5 x 10^-5 = X^2 / 0.043 - X

=> X = 1.037 x 10^-3 M

% ionization = X * 100 / Inital conc. of HN3 = 1.037 x 10^-3 x 100 / 0.043 = 2.41 %

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