20 mL of 0.1 M H2SO4 solution is added to 30 mL of 0.2 M NH4OH solution. The pH of the resultant mixture is: [pkb of NH4OH = 4.7]

Engineering

Chemistry

Buffer Solution

Question

20 mL of 0.1 M H₂SO₄ solution is added to 30 mL of 0.2 M NH₄OH solution. The pH of the resultant mixture is: [pk_b of NH₄OH = 4.7]

5.2

9.0

9.4

5.0

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$\underset{\begin{matrix} 2 m . m \\ - \end{matrix}}{H_{2} {SO}_{4}} + \underset{\begin{matrix} 6 m . m \\ 2 m . m \end{matrix}}{2 {NH}_{4} OH} \overset{}{\to} \underset{\begin{array}{l} 2 m . m \end{array}}{{({NH}_{4})}_{2} {SO}_{4}} + 2 H_{2} O$

$pOH = 4 .7 + \log \frac{4}{2} = 5$

pH = 14 – 5 = 9