NH4Cl is a salt formed by the reaction of a strong acid and a weak base.
we can determine the pH by the following formula:
pH = 1/2(pKw) - 1/2 log C - 1/2 pKb
here pKw = 14
C = 0.033 M
pKb=4.74
so pH = 1/2*14 - 1/2 log 0.033 -1/2 4.74 = 7 - 1/2(-1.48) - 2.37 = 5.37
so pH = 5.37
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