用95%和45%的乙醇配制75%的乙醇溶液500ml,应取95%和45%的乙醇各

考试题库2022-08-02  23

问题 用95%和45%的乙醇配制75%的乙醇溶液500ml,应取95%和45%的乙醇各A.250ml,250mlB.260ml,240mlC.300ml,200mlD.245ml,255mlE.350ml,150ml

选项 A.250ml,250ml
B.260ml,240ml
C.300ml,200ml
D.245ml,255ml
E.350ml,150ml

答案 C

解析 应取95%乙醇的体积为:(75%×500-45%×500)/(95%-45%)=300ml,应取45%乙醇的体积为200ml。
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本试题收录于: 药学师题库药学类分类

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