An aqueous solution is made with the salt obtained from combining the weak acid acetic acid,...
An aqueous solution is made with the salt obtained from combining the weak acid acetic acid, CH3CO2H, and the weak base methylamine, CH2NH2. Is the solution acidic, basic, or neutral? Ka=1.8×10−5 and Kb=4.4×10−4
Homework Answers
This is the salt formed by weak acid and weak base.
CH3COOH + CH3NH2 --------------> CH3COO- CH3NH3+
PKa = -log Ka PKb=-log Kb PKw = -log Kw
PKa = -log (1.8 x 10-5) PKb = -log ( 4.4 X 10-4) PKw = - log 10-14
PKa = 4.74 PKb = 3.35 PKw = 14
pH = 1/2 ( PKw + PKa - PKb )
pH = 1/2 ( 14 + 4.74 - 3.35 )
pH = 7.69
Hence the solution made by this salt is basic solution.
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