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What is [H+] in mol/L of a solution that is 0.20 M in CH3COONa and 0.10 M in CH3COOH?

(Ka for CH3COOH = 1.8 x 10-5)       

(a) 3.5x10-4             (b) 1.1x10-5

(c) 1.8x10-5             (d) 9.0x10-6