Equilibrium Question 815

Question: 20 mL of 0.2 M NaOH are added to 50 mL of 0.2 M CH2COOH

(Ka=1.8×10 5) the pH of the solution is

Options:

A) 4.56

B) 4.73

C) 9.45

D) 6.78

Show Answer

Answer:

Correct Answer: A

Solution:

Conc.=MillimolesTotal,Volume

[CH3COOH]=670;[CH3COONa]=470

pH=log1.8×105+log4/706/70,pH=4.56



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