. The first ionization constant of H2S is

9.1 x 10–8 . Calculate the concentration of HS– ion in its 0.1 M solution. How will this concentration be affected if the solution is 0.1 M in HCl also? If the second dissociation constant of H2S is 1.2 x10–13, calculate the concentration of S2– under both conditions.

Best Answer

Answer: (i) To calculate the concentration of HS– ion:

Case I (in the absence of HCl):

Let the concentration of HS– be x M.


Case II (in the presence of HCl):

In the presence of 0.1 M of HCl, let [HS-] be y M



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