a) What happens when you add acid to a solution of 0.1 M HNO2 and 0.1...

a) What happens when you add acid to a solution of 0.1 M HNO2 and 0.1 M KNO2? Write a chemical equation if relevant.

b) Why doesnt the same kind of reaction occur when you add acid to a solution of 0.1 M HNO3 and 0.1 M KNO3?

Solutions

Expert Solution

pKa of HNO2 = 3.15, pKa of HNO3 = -1.3,

pKa of acid determines its acidic nature, where,

pKa is inversely proportional to acidic nature

Hence, H+ will be donated by an acid having low pKa

HA + 2HNO2 ----> A- + NO+ + H2O

HA + KNO2 ------> KA + HNO2

Here HNO3 is more stronger acid because of its low pKa value than HNO2, Hence the reactions values differ.

HA + HNO3 -----> NO3- + H2A+

HA + KNO3 ----> HNO3 + KA

Hence the reaction of acids will be different with HCl and HA.

queen_honey_blossom answered 1 year ago

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