Nitric acid (HNO3) is a strong acid that is completely ionized in aqueous solutions of concentrations ranging from 1% to 10% (1.50 M ). However, in more concentrated solutions, part of the nitric acid is present as un-ionized molecules of HNO3. For example, in a 50% solution (7.50 M ) at 25°C, only 33% of the molecules of HNO3 dissociate into H+ and NO3–. What is the value of Ka for HNO3?

Question
Asked Oct 24, 2019

Nitric acid (HNO3) is a strong acid that is completely ionized in aqueous solutions of concentrations ranging from 1% to 10% (1.50 ). However, in more concentrated solutions, part of the nitric acid is present as un-ionized molecules of HNO3. For example, in a 50% solution (7.50 ) at 25°C, only 33% of the molecules of HNO3 dissociate into H+ and NO3. What is the value of Ka for HNO3?

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Expert Answer

Step 1

Given:

Concentration of HNO3 = 7.50 M

% dissociation of HNO3 = 33%

We need to calculate the Ka of HNO3

Step 2

The equilibrium concentration are,

[H+] = [NO3-] = 33% [HNO3] = 0.33 X7.50 = 2.48 M

Step 3

Construct ICE table:

                HNO3   ↔    H++ NO3-

I            7.50               0                 0

C       &nbs...

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