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
药学(师 ) 2023-06-30
A:250ml,250ml
B:260ml,240ml
C:300ml,200ml
D:245ml,255ml
E:350ml,150ml
参考答案:C
B:260ml,240ml
C:300ml,200ml
D:245ml,255ml
E:350ml,150ml
参考答案:C
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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