Sulfuric acid, H2SO4, is a well known acid containing sulfur. However, two other sulfur-containing acids are hydrogen sulfide, H2S, and sulfurous acid, H2SO3.
Hydrogen sulfide is a weak acid and dissociates in two stages as shown.
Stage 1 H2S(aq) + H2O(1) H3O+(aq) + HS-(aq)
Ka1 = 8.91 x 10-8 mol dm-3
Stage 2
HS- (aq) + H2O(l) = H2O+(aq) + S2-(aq)
Ka2 = 1.20 x 10-13 mol dm-3
1. Write the Ka expressions for Ka1, Ka2
II. A solution of hydrogen sulfide has an initial concentration of 0.100 moldm-3. Use Ka1 to
calculate the equilibrium concentration, in moldm-3, of the hydrogensulfide ion, HS-
Give your answer to three significant figures.

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