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Question

The pH of a solution of NH4Cl is 4.86. calculate the molar concentration of the solution if Kb=1.0×105 and Kw=1.0×1014.

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Solution

NH4Cl: Acide salt
pH=4.86;Kb=105
we know for an acidic salt
pH=712(PKb+logc)
4.86=712(log(105)+logc)
4.28=5+logc
c=0.19
[NH4Cl]=0.19 M

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