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维生素C片(规格25mg)含量测定,取本品20片,精密称定为研细,精密称取片粉置100ml量瓶中,加新沸过的冷蒸馏水100ml与稀醋酸10ml的混合液适量,振摇使维生素C溶解并稀释至刻度,摇匀,经干燥滤纸迅滤过,精密量取续滤液50ml,加淀粉指示液1ml,用碘滴定液(0.1mol/L)滴定至终点,,每1ml碘滴定液(0.1mol/L)相当于8.806mg的C6H8O6,求该片剂标示量的百分含量。 实验数据:20片总重:0.5000 克;片粉称量:0.2000克;实验室硝酸银浓度:0.1000mol/L;消耗碘滴定液10.00ml
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