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Calculate the pH of a 0.18 M solution of KNO2. (Ka (HNO2) = 4.5 x 10-4) Group of answer choices 5.70 8.30 2.05 11.95 9.91

Calculate the pH of a 0.18 M solution of KNO2. (Ka (HNO2) = 4.5 x 10-4) Group of answer choices 5.70 8.30 2.05 11.95 9.91

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Calculate the pH of a 0.18 M solution of KNO2. (Ka (HNO2) = 4.5 x 10-4)

Group of answer choices
5.70
8.30
2.05
11.95
9.91
Expert Solution
Step 1

Given : Concentration of KNO2 = 0.18 M

And Ka of HNO2 = 4.5 X 10-4 

Since KNO2 is a completely soluble ionic compound. Hence it will dissociate complete producing NO2- and K+ ions.

Hence concentration of NO2- ions = concentration of KNO2 taken = 0.18 M

 

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