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The ionization constant, Kb, for the weak base trimethylamine, (CH3)3N, is 7.4 × 10-5. What is the pH...?
The ionization constant, Kb, for the weak base trimethylamine, (CH3)3N, is 7.4 × 10-5. What is the pH of a 0.040 molar solution of this base?
A. 9.87
B. 8.37
C. 10.70
D. 12.60
E. 11.23
1 Answer
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- jacob sLv 71 decade agoFavorite Answer
E. 11.23
kb=x^2/(0.040-x)=7.4 x 10^-5
x=.001684
pOH=-log(.001684)=2.7763
pOH+pH=14
2.7763+pH=14
pH=14-2.7763
pH=11.23
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