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【单选题】
将0.5000g铁矿石用酸溶解,用还原剂将Fe3+全部还原为Fe2+,然后用0.1000mol/L的Ce(SO4)2标准滴定溶液进行滴定,消耗25.50mL,则矿石中铁的质量分数为()。M(Fe)=55.85g/mol。A.
0.0723
B.
0.1446
C.
0.2848
D.
0.5697
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