高锰酸钾滴定
用滴瓶以减量法对三种规格的产品称量如下:27.5 %规格的产品,称量约0.15-0.20g的试样;35%规格的产品,称量约0.12-0.16 g的试样;50%规格的产品,称量约0.10-0.12 g的试样,精确到0.0002 g .置于一盛有100m L硫酸溶液(1:15)的250m L锥形瓶中,用高锰酸钾标准溶液(c(1/5KMnO4)=0.1mol/L)滴定至溶液呈粉红色,并在30s 内不消失即为终点.
X=1.70V.c/m
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