Buffer solutions can be prepared from mixtures of P (1) \( \mathrm{...

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Buffer solutions can be prepared from mixtures of
P
(1) \( \mathrm{HCl} \) and \( \mathrm{NaCl} \)
W
(2) \( \mathrm{NaH}_{2} \mathrm{PO}_{4} \) and \( \mathrm{Na}_{2} \mathrm{HPO}_{4} \)
(3) \( \mathrm{CH}_{3} \mathrm{COOH}+\mathrm{NaCl} \)
(4) \( \mathrm{NH}_{4} \mathrm{OH}+\mathrm{NH}_{3} \)
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