Equilibrium shift in this task?
Hello everyone!
I wanted to ask why NH3 is the correct answer for this problem. Thanks in advance.
Best regards
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NH3 is a base, thus increasing the pH — alternatively, it eats H3O+ ions. Since these are removed from the equilibrium, more hydrogen sulfide can react to sulfide.
PbS does not dissolve, but NaCl does not influence the H3O+ ions. That would not change at the sulfide ion concentration.
However, HCl and NaHSO4 are acidic. The addition of these substances thus provides additional H3 O+ ions and would lower the sulfide ion concentration.
Thanks for the detailed answer, now I understand. :