Calculate the sulfide ion concentration in a saturated H2S solution when the pH is 0.5. The concentration of a saturated H2S solution is about 0.1 mol/ liter.
H2S + H2O ℀ H3O+ + HS- Ka1 = 1.1x10^-7
HS- + H2O ℀ H3O+ + S2- Ka2 = 1.01x10^-14
How many sulfide ions are present in one milliliter of the above solution?