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Social ScienceNitric 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?
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?
Expert Answer
Given:
Concentration of HNO3 = 7.50 M
% dissociation of HNO3 = 33%
We need to calculate the Ka of HNO3
The equilibrium concentration are,
[H+] = [NO3-] = 33% [HNO3] = 0.33 X7.50 = 2.48 M
Construct ICE table:
HNO3 ↔ H++ NO3-
I 7.50 0 0
C &nbs...
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