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[4] AMPHOTERIC SALTS HYDROLYSIS :

Example of amphoteric salts  NaHS, NaHCO3, Na2HPO4, NaH2PO4

Both reaction will support each other extent of hydrolysis and extent of dissociation is same.
ILLUSTRATIVE EXAMPLE: Calculate pH of solution of
(1) 100 ml 0.1M H3PO4 + 100 ml 0.1M NaOH.
(2) 100 ml 0.1M H3PO4 + 200 ml 0.1M NaOH.
(3) 100 ml 0.1M H3PO4 + 300 ml 0.1M NaOH.
(4) 100 ml 0.1M H3PO4 + 400 ml 0.1M NaOH.
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