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6-2.Equilibrium-II (Ionic Equilibrium)
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બિસ્મથ સલ્ફાઈડ $\left( Bi _{2} S _{3}\right)$ માટે $K _{ sp }$ એ $1.08 \times 10^{-73}$છે .$298\,K$ પર $Bi_{2}S _{3}$ ની દ્રાવ્યતા $mol\,L^{-1}$ માં શોધો.
A
$1.0 \times 10^{-15}$
B
$2.7 \times 10^{-12}$
C
$3.2 \times 10^{-10}$
D
$4.2 \times 10^{-8}$
(JEE MAIN-2022)
Solution
$Bi _{2} S _{3} \rightleftharpoons 2 Bi ^{3+}+3 S ^{2-}$
$\,\quad\quad\quad\quad2s\quad\quad\quad3s$
$k _{ sp } =(2 s )^{2}(3 s )^{3}$
$=4 s ^{2} \times 27( s )^{3}$
$=108( s )^{5}$
$( s )^{5} =\frac{1.08 \times 10^{-73}}{108}$
$\Rightarrow s =10^{-15}$
Standard 11
Chemistry
