JEE Mains · Chemistry · STD 11 - 6.2. Equilibrium - II (icon Equilibrium)
The \(pH\) of ammonium phosphate solution, if \(pK _{ a }\) of phosphoric acid and \(pk _{ b }\) of ammonium hydroxide are \(5.23\) and \(4.75\) respectively, is ..... .
- A \(11\)
- B \(9\)
- C \(7\)
- D \(8\)
Answer & Solution
Correct Answer
(C) \(7\)
Step-by-step Solution
Detailed explanation
Since \(\left( NH _{4}\right)_{3} PO _{4}\) is salt of weak acid \(\left( H _{3} PO _{4}\right)\) and weak base \(\left( NH _{4} OH \right)\) \(pH =7+\frac{1}{2}( pka - pkb )\) \(=7+\frac{1}{2}(5.23-4.75)\) \(=7.24 \approx 7\)
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