Question

At $298K$ a $0.1MC{H}_{3}COOH$ solution is $1.34\%$ ionized. The ionization constant $K_a$ for acetic acid will be______

• A. $1.82\times {10}^{-5}$
• B. $18.2\times {10}^{-5}$
• C. $0.182\times {10}^{-5}$
• D. None of these

Answer 1

The correct option is A $1.82\times {10}^{-5}$

$K=c{\alpha }^2=0.1\times {\left(\frac{1.34}{100}\right)}^2=1.8\times {10}^{-5}$