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  4. pH of which of the following solutions is not affected by dilution?

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Q. $pH$ of which of the following solutions is not affected by dilution?

Equilibrium

Solution:

Aqueous solution of a salt of a weak acid and a weak base acts as a buffer solution. The pH of a buffer does not change on dilution. $HCO_3^-$ (from $NaHCO_3$) and $H_2PO_4^-$ (from $NaH_2PO_4$) are amphiprotic anions. The pH of solution containing amphiprotic anions do not change on dilution.