Hello!

for the 1st one: if you add HCl into the solution, the solution will become acidis as it dissolves and gives H+. In this case, in order to balance it the equation will shift to the left hence increasing the h2s concentration.

3rd one: when sodium sulfide dissolves it will give of S ions. increasing of S in the right. shift to the left

(correct me if I am wrong but this is what I remember)

Thank you, Nihan! Now I understand

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