Q22 / 180 · COMEDK 2019 · Chemistry

$5 \mathrm{~L}$ of $\mathrm{NaOH}$ solution of $\mathrm{pH} 12$ contains

  • A
    $200 \mathrm{~g}$
  • B
    $0.2 \mathrm{~g}$
  • C
    $20 \mathrm{~g}$
  • Correct answer
    D
    $2 \mathrm{~g}$

Solution

$M_{1}=5 \mathrm{~L}$ and pH $=12$ $$ \mathrm{pOH}=14-\mathrm{pH}=14-12=2 $$ ${[\mathrm{OH}]=10^{-\text {pOH }}=10^{-2} }$ $\therefore$ Mass of $\mathrm{NaOH}=$ moles $\times$ molar mass

Hence, the correct answer is option: 'D'.

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