溴甲酚绿－甲基红指示剂
溶液Ⅰ：称取0.1g溴甲酚绿溶于95%乙醇,用95%乙醇稀释至100mL.
溶液Ⅱ：称取0.2g甲基红溶于95%乙醇,用95%乙醇稀释至100mL.
取30mL溶液Ⅰ、10mL溶液Ⅱ,混匀.
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