# What is a chemical reaction that shows what happens when HCN dissolves in water?

H-C-=N + H_2OrightleftharpoonsH_3O^+ +""^(-)C-=N
Hydrogen cyanide behaves as a weak Bronsted acid: $p {K}_{a} = 9.21$.
In water, cyanide salts such as Na^(+)""^(-)C-=N give rise to a slightly basic solution. Why so?