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The first ionization constant of H2S is 9.1 × 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 × 10–13, calculate the concentration of S2– under both conditions. 

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(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

To calculate the concentration of [S2-

Case I (in the absence of 0.1 M HCl): 

Case II (in the presence of 0.1 M HCl): 

Again, let the concentration of HS– be X' M. 

  (From first ionization, case II) 

                                          (From HCl, case II) 

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