In the following reaction, which way should the equilibrium shift when hcl is added? why?
which way does it shift and why
Answer:
This is an equilibrium in which
Ks = [Mg2+][OHˉ]²
If you add HCl, this contains H+ ions which react with the OHˉ ions, thus decreasing the [OHˉ]. Because Ks is a constant and [OHˉ] has decreased, [Mg2+] must increase and the only way this can happen is for more Mg(OH)2 to dissolve, so the equilibrium shifts to the right.
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it will be shifted to the right, since the OH produced will react with the HCl, thus requiring more Mg(OH)2 to dissolve.
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