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Q. The $pH$ of a solution obtained by mixing $50 \,mL$ of $1\, M\, HCl$ and $30\, mL$ of $1\, M\, NaOH$ is $x \times 10^{-4}$. The value of $x$ is _______ (Nearest integer) $[\log 2.5=0.3979]$

JEE MainJEE Main 2021Equilibrium

Solution:

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$[ HCl ]=\frac{20}{80}=\frac{1}{4} M =2.5 \times 10^{-1} M$
$pH =-\log 2.15 \times 10^{-1}=1-0.3979=0.6021$
$pH =6021 \times 10^{-4}$