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Problem 16.63 Calculate the percent ionization of hydrazoic acid (HN3) in solutions of each of the...

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

0.388 M .

Express your answer using two significant figures.

  %  

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Part B

0.117 M .

Express your answer using two significant figures.

  %  

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Part C

3.61×10−2 M .

Express your answer using two significant figures.

  %  

Homework Answers

Answer #1

Ka = Cα2    α= percent ionization

α = (Ka/C)1/2

Ka of hydrazoic acid (HN3) = 1.9 x10-5

A) C= 0.388 M

α = (Ka/C)1/2

= ( 1.9 x10-5 / 0.388)1/2

= 0.007

= 0.7 %

Therefore,  percent ionization = 0.7 %

B)

C= 0.117 M

α = (Ka/C)1/2

= ( 1.9 x10-5 / 0.117)1/2

= 0.012

= 1.2 %

Therefore,  percent ionization =1.2 %

C)

C= 3.61×10−2 M

α = (Ka/C)1/2

= ( 1.9 x10-5 / 3.61×10−2 )1/2

= 0.023

= 2.3 %

Therefore,  percent ionization = 2.3 %

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