制备酚酞指示剂
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酚酞（C20H14O4）溶于乙醇 其乙醇溶液遇碱变红。
酚酞指示剂(0.5%酚酞乙醇溶液)：取0.25g酚酞,用乙醇溶解,并稀释至50mL,无需加水。1%是质量比具体配制是把1g的酚酞溶于1L90%的乙醇中配制好了之后只需摇匀,使之形成均匀溶液
酚酞指示剂(0.5%酚酞乙醇溶液)：取0.25g酚酞,用乙醇溶解,并稀释至50mL,无需加水。1%是质量比具体配制是把1g的酚酞溶于1L90%的乙醇中配制好了之后只需摇匀,使之形成均匀溶液
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