[denialisafad]

So I have a question. What is the [S -2] in a saturated solution 9.10 M of H2S, in which the pH has been adjusted to 5.00 by the addition of HCl? For H2S, Ka1= 1.1 x 10-7 and Ka2 = 1.0 x -14.

[AWK]

At pH of 5 only H₂S exists which solubility is about 0.1 M.
Approximate concentration of S^2- can be calculated from
K₁K₂=[H₃O⁺]²[S^2-]/[H₂S]