Which of the following solutions cannot act as a buffer (1) \( \mathrm{NaH}_{2} \mathrm{PO}_{4}+...

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Which of the following solutions cannot act as a buffer
(1) \( \mathrm{NaH}_{2} \mathrm{PO}_{4}+\mathrm{H}_{3} \mathrm{PO}_{4} \)
(2) \( \mathrm{CH}_{3} \mathrm{COOH}+\mathrm{CH}_{3} \mathrm{COONa} \)
(3) \( \mathrm{HCl}+\mathrm{NH}_{4} \mathrm{Cl} \)
(4) \( \mathrm{H}_{3} \mathrm{PO}_{4}+\mathrm{Na}_{2} \mathrm{HPO}_{4} \)

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