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    Hi ! I'm stuck on this exercise.

    A solution of 100mL of Hydrogen sulfide H2S is mixed with 10mL of a solution of OH-.

    So there are two equilibrium and I need to calculate the pH of the resulting solution.

    Could you please give me any hints ? Thank you !

    Data:
    H2S --> c=0.02 M ;
    OH --> c=0.1 M ;

    pka1(H2S/HS)=7,0
    pka2(HS/S)= 12,8
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    H2S + OH- <-> HS- + H2O
    HS- + OH- <-> S2- + H2O

    How many mol of each chemical do you have? Enough to push the first equilibrium to the right? Enough to push the second one?
 
 
 
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