Hypochlorous acid ($HOCl$) has $p{K}_a=7.53$ at $25°C$. What is its acid dissociation constant $K_a$?

• A. $K_a=3.39\times {10}^{-1}$
• B. $K_a=2.95\times {10}^{-8}$
• C. $K_a=2.95\times {10}^8$
• D. $K_a=7.53\times {10}^{-7}$

Answer: (B)