Solution: Hydrogen cyanate (HOCN, K a = 3.3 x 10 -4) is a distant cousin of the more (in)famous compound, hydrogen cyanide (HCN, K a = 4.0 x 10 -10), but it still manages to eke out a comfortable living as a weak acid in chemistry text books. A. Which is more basic: OCN - or CN - ?explain your reasoning.   B. Determine Kc for the reaction HCN + OCN - ⇌ CN - + HOCN

Problem

Hydrogen cyanate (HOCN, K a = 3.3 x 10 -4) is a distant cousin of the more (in)famous compound, hydrogen cyanide (HCN, K a = 4.0 x 10 -10), but it still manages to eke out a comfortable living as a weak acid in chemistry text books.

A. Which is more basic: OCN - or CN ?explain your reasoning.

 

B. Determine Kc for the reaction

HCN + OCN - ⇌ CN - + HOCN