Question

the ksp of Mg(oH)2 is 4×10^-12.The number of moles of Mg2+ ions in 1 litre of its saturated solution in 0.1M NaoH is

Answer 1

Ksp = [Mg2+] [OH¯]2

Let the concentration of Mg2+ ions to form saturated solution be s mol/litre

4 x 10-12 = s x (0.1)2

s = 4 x 10-10 mol/litre

Volume of solution = 1 litre

Number of moles of Mg2+ = Molarity x Volume = ​4 x 10-10 x 1 = ​4 x 10-10 mol

Answer 2

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