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6-2.Equilibrium-II (Ionic Equilibrium)
medium
$25°$ સે. એ $M(OH)_2$ નો દ્રાવ્યતા ગુણાકાર $32 \times 10^{-12}$ છે તો $M(OH)_2$ ના સંતૃપ્ત દ્રાવણની $pOH $ કેટલી થાય ?
A
$4 - log 4$
B
$2 - log 4$
C
$2 - log 8$
D
$4 - log 2$
Solution
$M(OH)_2 ⇌ [M^{+2}] [OH^{-1}]^2$
$ (s)$ $ (2s)^2$
$K_{sp} = 4s^3$ $4s^3 = 32 \times 10^{-12} $
${s^3} = \frac{{32 \times {{10}^{ – 12}}}}{4} = 8 \times {10^{ – 12}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,s = {(8 \times {10^{ – 12}})^{1/3}} = 2.0 \times {10^{ – 4}}$
$[O{H^ – }] = 2 \times 2.0 \times {10^{ – 4}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,[O{H^ – }] = 4.0 \times {10^{ – 4}}\,\,pOH = 4 – \log 4$
Standard 11
Chemistry
