Question

Which $K_a$ value is that of an acid that is the weakest electrolyte?

• A. $1.7\times {10}^{-7}$
• B. $2.7\times {10}^{-4}$
• C. $6.6\times {10}^{-10}$
• D. $4.9\times {10}^{-3}$
• E. $5.2\times {10}^{-4}$

Answer 1

Answer: (C)

$6.6\times {10}^{-10}$

The strength of an acid electrolyte is directly proportional to its $K_a$ value. Lower is the $K_a$ value, weaker is the electrolyte. Among the given $K_a$ values, the lowest $K_a$ value is $6.6\times {10}^{-10}$ which represents the weakest electrolyte.