JEE MAIN - Chemistry (2021 - 26th February Evening Shift - No. 22)
The pH of ammonium phosphate solution, if pka of phosphoric acid and pkb of ammonium hydroxide are 5.23 and 4.75 respectively, is ___________.
Answer
7
Explanation
Since (NH4)3PO4 is salt of weak acid (H3PO4) & weak base (NH4OH).
pH = 7 + $${1 \over 2}$$(pka $$-$$ pkb)
= 7 + $${1 \over 2}$$ (5.23 $$-$$ 4.75)
= 7.24 $$ \approx $$ 7.
pH = 7 + $${1 \over 2}$$(pka $$-$$ pkb)
= 7 + $${1 \over 2}$$ (5.23 $$-$$ 4.75)
= 7.24 $$ \approx $$ 7.
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