A 0.10 mol dm$^{–3}$ aqueous solution of an acid is added slowly to 25 cm$^3$ of a 0.10 mol dm$^{–3}$ aqueous solution of a base.
Which acid–base pair has the highest pH at the equivalence point?
CH$_3$COOH and NaOH
2 )
CH$_3$COOH and NH$_3$
3 )
HCl and NaOH
4 )
HCl and NH$_3$
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