头孢噻吩钠的氯化钠等渗当量为0.24,2%的头孢噻吩钠100ml调成等渗溶液,需加入的氯化钠为A:0.64gB:0.52gC:0.42gD:0...

作者: rantiku 人气: - 评论: 0
问题 头孢噻吩钠的氯化钠等渗当量为0.24,2%的头孢噻吩钠100ml调成等渗溶液,需加入的氯化钠为
选项 A:0.64g B:0.52g C:0.42g D:0.52g E:0.84g
答案 C
解析 按照氯化钠等渗当量法计算,X=0.9%V-EW,X:药物溶液中需加等渗调节剂的量(g);V为欲配制药物溶液的体积(ml),E为1g药物的氯化钠等渗当量(可由表查得或测定);W为溶液中药物的量(g)。所以X=0.9%*100-0.24*2=0.42(g)。

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