JEE Main Chemistry question
A weak acid HX (Ka=1×10⁻⁵) on reaction with NaOH gives NaX. For a 0.1 M aqueous solution of NaX, the % hydrolysis is:
Answer: (B)
Solution
Kh=Kw/Ka=10⁻⁹. h=√(Kh/C)=√(10⁻⁹/0.1)=10⁻⁴=0.01%.
A weak acid HX (Ka=1×10⁻⁵) on reaction with NaOH gives NaX. For a 0.1 M aqueous solution of NaX, the % hydrolysis is:
Kh=Kw/Ka=10⁻⁹. h=√(Kh/C)=√(10⁻⁹/0.1)=10⁻⁴=0.01%.