Question

In: Chemistry

What is the pH of a solution of 0.20 M HNO2?

Expert Solution

Solution :-

Lets make the ICE table for the following reaction equation.

HNO2 + H2O ----------- > H3O^+ + NO2^-

0.20 0 0

-x +x +x

0.20-x x x

ka = [H3O+][NO2^-]/[HNO2]

7.1*10^-4 = [x][x]/[0.20-x]

7.1*10^-4 * 0.20 -x = x^2

solving for x we get

[H3O+] = x= 0.01157

therefore

pH = -log [H3O+]

pH= - log [0.01157]

pH= 1.94

Therefore the pH of the solution = 1.94

queen_honey_blossom answered 2 hours ago

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