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【单选题】
烟酸片的含量测定:取本品20片,精密称定重量为7.1680g,研细,取片粉0.3729g,加新沸放冷的水50ml,加热使溶解,放冷,用氢氧化钠滴定液(0.1mol/L)滴定,消耗25.20ml,每1mlNaOH滴定液(0.1mol/L)相当于12.31mg烟酸,已知烟酸片规格0.3g,NaOH滴定液(0.1mol/L)的F=1.005,计算每片烟酸的含量A.
83.60%
B.
0.2996g
C.
99.38%
D.
0.8360g
E.
0.9938g
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Credit Cards for the Poor
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