Acetic acid is a weak acid, with a Ka value of 1.8 x 10 -5:
CH3COOH (aq) + H2O(l) ⇋ CH3COO-(aq) + H3O+
A solution of acetic acid is made by diluting 20.0mL of glacial acetic acid with enough water to make 250.0mL of solution. ("Glacial acetic acid" is the commercial name for pure acetic acid, which has a density of 1.05 g/mL.) What is the concentration of acetate ion in the solution?
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