Problem: What is the pH of a 0.015 M aqueous solution of hydrazoic acid (HN 3) (Ka = 1.9 x 10–5) at 25°C?a. 2.89b. 1.82c. 3.28d. 6.55e. 4.87

FREE Expert Solution

We’re being asked to calculate the pH of a 0.015 M aqueous solution of hydrazoic acid, HN3.


Since HN3 has a low Ka value, it’s a weak acid. Remember that weak acids partially dissociate in water and that acids donate H+ to the base (water in this case)


The dissociation of HN3 is as follows:


HN3(aq) + H2O(l) H3O+(aq) + N3(aq)Ka = 1.9 × 10–5



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Problem Details

What is the pH of a 0.015 M aqueous solution of hydrazoic acid (HN 3

(Ka = 1.9 x 10–5) at 25°C?

a. 2.89

b. 1.82

c. 3.28

d. 6.55

e. 4.87

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What scientific concept do you need to know in order to solve this problem?

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