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  4. When 50 mL of 0.1 M NH3 is mixed with 10 mL of 0.1 M HCl then what is the pH of resultant solution? (pKb = 4.75 )

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Q. When $50\, mL$ of $0.1\, M NH_3$ is mixed with $10\, mL$ of $0.1\, M \,HCl$ then what is the pH of resultant solution? $(pK_b = 4.75$ )

AIIMSAIIMS 2018Equilibrium

Solution:

image
$pOH=pK_{b}+log \frac{\left[salt\right]}{\left[base\right]}$
$=4.75+log\left(\frac{1}{4}\right)=4.15$
$pH=14-pOH=14-4.15=9.85$