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酢酸と酢酸ナトリウムを用いて、pH=5.0 の緩衝液を作る。この際の酢酸と酢酸ナトリウムの濃度比として適当なものを選びなさい。なお、酢酸のKaはKa = 1.8 x 10-5 であり、活量係数は1.0としてよい。
By use of acetic acid and sodium acetate, we prepare a buffer solution of pH = 5.0. Answer the ratio of CH3CO2H : CH3CO2Na. Acid constant of acetic acid is Ka = 1.8 x 10-5, and activity coefficient can be treated as 1.0.