1. Tardigrade
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  3. Chemistry
  4. Ionization constant of acetic acid is 1.8 × 10-5. The concentration of H+ions in 0.1 M solution is ;

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Q. Ionization constant of acetic acid is $1.8 \times 10^{-5}$. The concentration of $H^{+}$ions in $0.1 \,M$ solution is ;

AFMCAFMC 2000

Solution:

$CH _{3} COOH$ ionise as follows :
image
$\left[ H _{3} O ^{+}\right]= C \alpha$
and $\alpha=\sqrt{K_{a} / C}$ (for any weak electrolyte)
or $\left[ H _{3} O ^{+}\right]=\sqrt{K_{a} \cdot C }$
$=\sqrt{1.8 \times 10^{-5} \times .1}=1.34 \times 10^{-3} M$