Q44 / 150 · MHT CET 2024 (10 May Shift 1) · Chemistry

What is the pH of $10^{-8} \mathrm{MHCl}$ solution?

  • A
    8
  • B
    7
  • Correct answer
    C
    < 7
  • D
    $\gt8$

Solution

$10^{-8} \mathrm{M}$ indicates a very dilute solution. Thus, $\left[\mathrm{H}^{+}\right]$from water cannot be ignored. But dissociation of water is suppressed due to common ion effect. $\left[\mathrm{H}^{+}\right] \neq 10^{-7}$, but less than $10^{-7}$. Hence, pH of $10^{-8} \mathrm{M}$ of HCl is less than 7 .

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

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