称取CaCO3试样0.2500g,溶解于25.00mL0.2006mol/L的HCl溶液中,过量的HCl用15.50mL0.2050mol/L的NaOH溶液进行返滴定,求此试样中CaCO3的质量分数()。M(CaCO3)=100.09g/mol
称取CaCO3试样0.2500g,溶解于25.00mL0.2006mol/L的HCl溶液中,过量的HCl用15.50mL0.2050mol/L的NaOH溶液进行返滴定,求此试样中CaCO3的质量分数()。M(CaCO3)=100.09g/mol
A.72.56%
B.36.78%
C.3.69%
D.7.26%
正确答案:B