Hydrosulfuric Acid Is a Diprotic Acid, for Which K_a1 =

Hydrosulfuric acid is a diprotic acid, for which K_a1 = 5.7 × 10^-8 and K_a2 = 1 × 10^-19.Determine the concentration of sulfide ion in a 0.10 M hydrosulfuric solution.

A) 0.10 M
B) 7.5 × 10^-5 M
C) 5.7 × 10^-9 M
D) 1 × 10^-19 M
E) 1 × 10^-20 M