54. Calculate the pH of a buffer prepared by mixing 300 cc of 0.3 M NH, and 500 cc of 0.5 M NH,CI. K. for NH, = 1.8 x 10-5 :- (1) 8.1187 (2) 9.8117 (3) 8.8117 (4) None of these CTION

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moles of ( mathrm{NH} 3=mathrm{M} times mathrm{L}=0.3 mathrm{M} times 0.3 mathrm{L}=0.09 mathrm{moles} ) moles of ( mathrm{NH} 4 mathrm{Cl}=mathrm{M} times mathrm{L}=0.5 mathrm{M} times 0.5 mathrm{L}=0.25 mathrm{moles} ) kb for ammonia ( =1.8 times 10^{wedge}-5 ) ( mathrm{pKb}=-log mathrm{Kb}=4.75 ) ( mathrm{pOH}=mathrm{pKb}+log [mathrm{salt}] /[text { base }] ) ( mathrm{pOH}=4.75+log 0.25 / 0.09 ) ( mathrm{pOH}=4.75-0.443 ) ( mathrm{pOH}=4.307 ) ( mathrm{pH}=14-mathrm{pOH}=14-4.307 ) ( mathrm{pH}=9.693 )

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