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测定某试样中锰和钒时,称取试样1.000g,溶解后,还原为Mn2+和VO2+,以0.02000mol/LKMnO4标准滴定溶液滴定,用去2.50ml,加入焦磷酸(使Mn3+形成为u稳定的焦磷酸盐配合物),继续用上述KMnO4标准滴定溶液滴定生成的Mn2+和原有的Mn3+使全部生成Mn3+,用去4.00ml,则试样中锰和帆的含量分别是()%。已知M(Mn)=54.94g/mol,M(V)=50.94g/mol,5VO2++MnO4-+11H2O===5VO3-+Mn2++22H+ MnO4-+Mn2++15H4P2O7===5Mn(H4P2O7)32-+4H2O+22H+
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