The pH 10 buffer used involves mixing ammonia and ammonium chloride. What is the molar ratio...
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The pH 10 buffer used involves mixing ammonia and ammonium chloride. What is the molar ratio of ammonia to ammonium chloride needed to produce a buffer with a pH of 10?
Homework Answers
PH = 10
POH = 14-PH
= 14-10
= 4
PKb = 4.75
POH = PKb + log[NH4Cl]/[NH3]
4 = 4.75 + log[NH4Cl]/[NH3]
log[NH4Cl]/[NH3] = 4-4.75
log[NH4Cl]/[NH3] = -0.75
[NH4Cl]/[NH3] = 10^-0.75
[NH4Cl]/[NH3] = 0.17783
[NH3]/[NH4Cl] = 1/0.17783
[NH3]/[NH4Cl] = 5.6233 /1
the molar ratio of ammonia to ammonium chloride = 5.6233 : 1
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