Nitrous acid, HNO2, has Ka = 4.5 x 10–4. What is the best description of the spe

Question

Nitrous acid, HNO2, has Ka = 4.5 x 10–4. What is the best description of the species present in 100 mL of a 0.1 M solution of nitrous acid after 100 mL of 0.1 M NaOH has been added?

A. NO2–(aq) is the predominant species; much smaller amounts of OH–(aq) and HNO2(aq) exist.

B. HNO2(aq), H+(aq), and NO2–(aq) are all present in comparable amounts.

C. H+(aq) and NO2–(aq) are the predominant species; much smaller amounts of HNO2(aq) exist.

D. HNO2(aq) is the predominant species; much smaller amounts of H+(aq) and NO2–(aq) exist.

Explanation / Answer

Answer:-

A. NO2-(aq) is the predominant species; much smaller amounts of OH-(aq) and HNO2(aq) exist.

As at the equivalence point, NO2- gets hydrolysed.

NO2-(aq) + H2O(l) <======> HNO2(aq) + OH-(aq)

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