The minimum  pH at which Mg(OH)2 is precipitated from 0.1 M Mg(NO3 )2 solution is (Given: Ks(Mg(OH)2 ) =9×10−15M3

The minimum  pH at which Mg(OH)2 is precipitated from 0.1 M Mg(NO3 )2 solution is (Given: Ks(Mg(OH)2 ) =9×1015M3

  1. A

    7.5

  2. B

    8.5

  3. C

    9.2

  4. D

    9.5

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    Solution:

    KsMg(OH)2=Mg2+OH2. hence OH=KsMg2+1/2=9×1015M30.1M1/2=3.0×107M

    pOH=log3.0×107=6.52 pH=146.52=7.48

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