JEE Mains · Chemistry · STD 11 - 6.2. Equilibrium - II (icon Equilibrium)
Consider the dissociation equilibrium of the following weak acid \(HA \rightleftharpoons H ^{+}( aq )+ A ^{-}( aq )\) If the pKa of the acid is 4 , then the pH of 10 mM HA solution is __________ . (Nearest integer)
[Given : The degree of dissociation can be neglected with respect to unity]
- A 1
- B 2
- C 3
- D 4
Answer & Solution
Correct Answer
(C) 3
Step-by-step Solution
Detailed explanation
\( pH=\frac{1}{2}[pK_{a}-\log c] \) \( pH=\frac{1}{2}[4-\log 10^{-2}] \) \(pH =3\)
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