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A buffer solution is 0.25 M CH3COOH -0.1...

A buffer solution is 0.25 M `CH_3COOH -0.15 M CH_3COONa,` saturated in `H_2S` (0.1 M) and has `[Mn^(2+)] =0015 M. K_a (CH_3COOH)= 1.74 xx 10^(-5)`.
`K_(a) (H_(2)S)=1.1 xx 10^(-21) and K_(sp) (MnS)=2.5 xx 10^(-13)`.
(a) Will MnS precipitate?
(b) Which buffer component should be increased in concentration and to which minimum value of just start precipitation of MnS?

Text Solution

Verified by Experts

The correct Answer is:
(a) No (b) `[CH_(3)OO^(-)] =1.7 M`
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Knowledge Check

  • The pH of a buffer solution of 0.1 M CH_(3)COOH and 0.1 MCH_(3)COONa is (pK_(a)CH_(3)COOH =4.745)

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    4.745
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    C
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    D
    6.745

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    A
    8.13
    B
    9.13
    C
    10.18
    D
    11.18

  • The pH of 7 xx 10^(-8) M CH_3COOH" is "(K_w=1 xx 10^(-14))

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