要配溴甲酚紫指示剂~~可是有2种配法~~1种是0.04g,0.01mol/LNaOH7.4ml,蒸馏水92.6ml;另1种是0.1g溶于95%的乙醇中,定溶至100ml。请问常用的溴甲酚紫指示剂应该用哪种方法配置啊?