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24/10/2021 11:33 am
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The 0.001M solution of Mg(NO3)2 is adjusted to pH 9, Ksp of Mg(OH)2 is 8.9 × 10-12. At this pH
(a) Mg(OH)2 will be precipitated
(b) Mg(OH)2 is not precipitated
(c) Mg(OH)3 will be precipitated
(d) Mg(OH)3 is not precipitated
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24/10/2021 11:38 am
Correct answer: (b) Mg(OH)2 is not precipitated
Explanation:
pH = 9 ; [H+] = 10-9; [OH-] = 10-5;
[Mg2+] = 1 x 10-3;
[Mg2+][OH-]2 = 1 x 10-13
Given Ksp of Mg(OH)2 = 8.9 × 10-12
Which is more than 1 x 10-13
Hence Mg(OH)2 will not precipitated