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The ionization constants for the diprotic acid H 2S are 1.0 x 10 -7 and 1.3...

The ionization constants for the diprotic acid H 2S are 1.0 x 10 -7 and 1.3 x 10 -13.
H2S (aq)          + H2O (l) <=> HS -(aq)     + H3O +(aq)                   Ka =    1.0 x 10 -7
HS -(aq)     + H2O (l) <=> S-2 (aq)    + H3O +(aq)                                     Ka =    1.3 x 10 -13
  
What is the equilibrium concentration of HS - in a 0.300 M solution of H2S?

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