The pKa of acetic acid, HC2H3O2, is 4.75. Whats the pH the buffer [HC2H3O2] = 0.2 M and [NaC2H3O2]= 2.0M?

3.75
4.75
5.75
7.00

Answer:
We use the equation :
pH = pKa + log [ CH3COO-] / [ CH3COOH ]
pH = 4.75 + log 2.0 / 0.2 = 5.75

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