I  need help understanding why the ratio of Acetate:Acetic acid = 3.5:1 and why the total amount would be 4.5.  The question was calculate the ratio of the concentrations of acetate and acetic acid required in a buffer system of pH 5.30. The pka of acetic is 4.76.  Where is the 1 coming from in the ratio 3.5:1

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