一天下午,“ChemLab软件教学价值开发”小组的同学如常在实验室开展研究性学习活动。实验的内容是“强碱滴定弱酸”。他们称取0.4gNaOH固体,用100mL的容量瓶配成NaOH溶液,再量取36%的CH3COOH溶液稀释配制成1mol/L的CH3COOH溶液。再拿出pH酸度计、滴定管、指示剂,在滴定管中装入25mLNaOH溶液,100mL的烧杯中装入15mLCH3COOH溶液,滴两滴酚酞指示 One afternoon, classmates of the “ChemLab Software Teaching Value Development” group conducted research-based learning activities in the laboratory as usual. The content of the experiment was “weak alkali titration of weak acid.” They weighed 0.4g of NaOH solids, made up a NaOH solution with a 100mL volumetric flask, and weighed 36% CH3COOH solution to prepare a 1mol/L CH3COOH solution. Take out the pH acidometer, burette, and indicator. Fill the burette with 25 mL of NaOH solution. Fill the 100 mL beaker with 15 mL of CH3COOH. Indicate with two drops of phenolphthalein.