How many grams of Ca{C₂}{O₄} will dissolve in distilled water to make one litre of saturated sol

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6-2.Equilibrium-II (Ionic Equilibrium)

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How many grams of $Ca{C_2}{O_4}$ will dissolve in distilled water to make one litre of saturated solution ? (Solubility product of $Ca{C_2}{O_4}$ is $2.5 \times {10^{ - 9}}\,mol{e^2}\,litr{e^{ - 2}}$ and its molecular weight is $128$)

A

$0.0064$ $gm$

B

$0.0128$ $gm$

C

$0.0032$ $gm$

D

$0.0640$ $gm$

Solution

(a) $Ca{C_2}{O_4}$ is a binary electrolyte. Then solubility is

$S = \sqrt {{K_{sp}}} = \sqrt {2.5 \times {{10}^{ – 9}}} $

$ = 5 \times {10^{ – 5}}$ $mole/l$. $ = 0.0064$ $gm/l.$

Standard 11

Chemistry

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