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【单选题】
用高锰酸钾法测定硅酸盐样品中Ca 2+ 的含量。称取样品0.5972g。在一定条件下, Ca 2+ 沉淀为CaC 2 O 4 过滤,洗涤沉淀,将洗涤的CaC 2 O 4 ,溶于稀硫酸中,用c(KMnO4)=0.05052mol/L的KMnO 4 标准溶液滴定,消耗25.62ml,硅酸盐中Ca的质量分数为( )
A.
24.19%
B.
21.72%
C.
48.38%
D.
74.60%
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