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【简答题】
10 mL 0.2 mol∙L – 1 HCl与10 mL 0.5 mol∙L – 1 NaAc混合后,溶液的pH值是多少(结果保留两位小数)?若向此溶液中再加入1 mL 0.5 mol∙L – 1 NaOH溶液,溶液的pH值又是多少(结果保留两位小数)? 已知: (HAc) = 1.76×10 -5 , (HAc) = 4.75,lg 2 = 0.301,lg 3 = 0.477,lg 7 = 0.845
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