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 0.100 mol の酢酸と 0.100 mol の酢酸ナトリウムを含む緩衝液 100 mL がある。この溶液に 0.0200 mol/L の水酸化ナトリウム...

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 0.100 mol の酢酸と 0.100 mol の酢酸ナトリウムを含む緩衝液 100 mL がある。この溶液に 0.0200 mol/L の水酸化ナトリウム(10.0 mL)を加えたときの pH を小数点以下2桁まで求めなさい。ただし,酢酸の pKa は4.75であり、溶液の活量係数は1.00としてよいとする。

There is a solution (100 mL) which contains acetic acid (0.100 mol) and sodium acetate (0.100 mol). To the solution, 0.0200 mol/L of sodium hydroxide (10.0 mL) was added. Answer the pH of the solution to the second decimal place. Acid constant of acetic acid is pKa = 4.75, and activity coefficient can be treated as 1.00.

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