contestada

In which aqueous solution will the most CaSO4 dissolve?

1)0.1 M CaCl2

2)0.1 M ZnSO4

3)0.1 M (NH4)2S

4)0.1 M Na2SO4

Respuesta :

3) 0.1 M (NH₄)₂S

in the ammonium sulfide solution

JannetPalos

Answer:

In 0.1 M [tex](NH_{4})_{2}S[/tex] solution, [tex]CaSO_{4}[/tex] will be most soluble

Explanation:

Dissociation equilibrium of [tex]CaSO_{4}[/tex] :

                      [tex]CaSO_{4}\rightleftharpoons Ca^{2+}+SO_{4}^{2-}[/tex]

According to Le-chatliers principle, addition of either [tex]Ca^{2+}[/tex] or [tex]SO_{4}^{2-}[/tex] ions into solution of  [tex]CaSO_{4}[/tex] leads to shifting in dissociation equilibrium toward left. Therefore solubility of  [tex]CaSO_{4}[/tex] decreases.

According to Le-chatliers principle, removal of either [tex]Ca^{2+}[/tex] or [tex]SO_{4}^{2-}[/tex] ions into solution of  [tex]CaSO_{4}[/tex] leads to shifting in dissociation equilibrium toward right. Therefore solubility of  [tex]CaSO_{4}[/tex] increases.

[tex]Ca^{2+}[/tex] gets removed from solution by forming sparingly soluble salt CaS upon addition of [tex](NH_{4})_{2}S[/tex] solution.

So solubility of [tex]CaSO_{4}[/tex] increases upon addition of [tex](NH_{4})_{2}S[/tex] solution

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