6-2.Equilibrium-II (Ionic Equilibrium)
medium

$1$ ग्राम कैल्सियम सल्फेट को घोलने के लिए कम से कम कितने आयतन जल की आवश्यकता होगी ? ( कॉपर आयोडेट के लिए $\left.K_{ sp }=7.4 \times 10^{-8}\right)$

Option A
Option B
Option C
Option D

Solution

${{\mathop{\rm CaSO}\nolimits} _{4(s)}} \leftrightarrow Ca_{\left( {aq} \right)}^{2 + } + SO_{4(aq)}^{2 – }$

${K_{sp}} = \left[ {C{a^{2 + }}} \right]\left[ {SO_4^{2 – }} \right]$

Let the solubility of $CaSO _{4}$ be $s$

Then, $K_{s p}=s^{2}$

$9.1 \times 10^{-6}=s^{2}$

$s=3.02 \times 10^{-3} \,mol / L$

Molecular mass of $CaSO _{4}=136$ $g / mol$

Solubility of $CaSO _{4}$ in $gram/L$

$=3.02 \times 10^{-3} \times 136$

$=0.41$ $g / L$

This means that we need $1$ $L$ of water to dissolve $0.41$ $g$ of $CaSO _{4}$

Therefore, to dissolve $1$ $g$ of $CaSO _{4}$ we require $=\frac{1}{0.41} L =2.44\, L$ os water.

Standard 11
Chemistry

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