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Salt of Weak Acid and Strong Base

29.What will ...

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29.What will happen if the pH of the solution of 0.001 M Mg(NO3)2 solution is adjusted to pH = 9 ( Ksp Mg(OH)2 = 8.9 X 10-12) a) ppt will take place b) ppt will not take place c) solution will be saturated d) None of the above

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0.001

M g (N O_{3})_{2}

p H = 9

K_{s p}

M g (O H)_{2} = 8.9 \times 10^{- 12}

[M g^{2 +}] [O H^{⊝}]^{2}

M g (O H)_{2}

M g (N O_{3})_{2}

K_{s p}

M g (O H)_{2} = 8.9 \times 10^{- 12}

25^{o} C,

1 \times 10^{- 4} M

M g (N O_{3})_{2}

M g (O H)_{2}

K_{s p} (M g (O H))_{2} = 8.9 \times 10^{- 12} M^{3} .

\sqrt{8.9} = 2.98

l o g 2.98 = 0.474

25^{o} C,

M g (O H)_{2}

10^{- 4} M

M g (N O_{3})_{2}

9.0

K_{s p} [M g (O H)_{2}]) = 10^{- 11} M^{3}

p H

M g {(O H)}_{2}

(K_{s p} = 4 \times 10^{- 12})

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