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

Question

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)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

Since ( NH 4)3 PO 4 is salt of weak acid ( H 3 PO 4) weak base ( NH 4 OH ) pH =7+(1/2)( pka - pkb ) =7+(1/2)(5.23-4.75) =7.24 ≈ 7

Q. The $p H$ of ammonium phosphate solution, if $p K_{a}$ of phosphoric acid and $p k_{b}$ of ammonium hydroxide are $5.23$ and $4.75$ respectively, is___

Since $(N H_{4})_{3} P O_{4}$ is salt of weak acid $(H_{3} P O_{4})$ & weak base $(N H_{4} O H)$

$p H = 7 + \frac{1}{2} (p ka - p kb)$

$= 7 + \frac{1}{2} (5.23 - 4.75)$

$= 7.24 \approx 7$

Q. The pH of ammonium phosphate solution, if pKa​ of phosphoric acid and pkb​ of ammonium hydroxide are 5.23 and 4.75 respectively, is___

Since (NH4​)3​PO4​ is salt of weak acid (H3​PO4​) & weak base (NH4​OH) pH=7+21​(pka−pkb) =7+21​(5.23−4.75) =7.24≈7

Q. The $p H$ of ammonium phosphate solution, if $p K_{a}$ of phosphoric acid and $p k_{b}$ of ammonium hydroxide are $5.23$ and $4.75$ respectively, is___

Since $(N H_{4})_{3} P O_{4}$ is salt of weak acid $(H_{3} P O_{4})$ & weak base $(N H_{4} O H)$

$p H = 7 + \frac{1}{2} (p ka - p kb)$

$= 7 + \frac{1}{2} (5.23 - 4.75)$

$= 7.24 \approx 7$