The addition of small volumes of a 0.10 M solution of a strong acid or a strong base has very little effect on the pH of a solution containing equimolar concentrations of
a) NaH2PO4 and Na2HPO4
b) NaOH and NaCl
c) H2SO4 and Na2CO3
d) K2CO3 and Na2CO3
e) HCl and NH3
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