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
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,250ml
B:260ml,240ml
C:300ml,200ml
D:245ml,255ml
E:350ml,150ml
B:260ml,240ml
C:300ml,200ml
D:245ml,255ml
E:350ml,150ml
参考解析
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。
相关考题:
用95%的乙醇配制75%的乙醇500ml,下面配制正确的是( )。A.量取95%乙醇395ml,用水稀释至500mlB.量取95%乙醇395ml,加入水105ml,混匀C.量称95%乙醇375ml,用水稀释500mlD.量取95%乙醇375ml,加入125ml水混匀
用95%和45%的乙醇配制75%的乙醇溶液500ml,应取95%和45%的乙醇各多少毫升A.250ml,250mlB.200ml,300mlC.300ml,200mlD.225ml,275mlE.275ml,225ml
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
用95%和45%的乙醇配制75%的乙醇溶液500ml,应取95%和45%的乙醇各多少体积A:250ml,250mlB:260ml,240mlC:300ml,200mlD:245ml,255mlE:350ml,150ml
用95%的乙醇配制75%的乙醇500ml,下面配制正确的是()。A、量取95%乙醇395ml,用水稀释至500mlB、量取95%乙醇395ml,加入水105ml,混匀C、量称95%乙醇375ml,用水稀释500mlD、量取95%乙醇375ml,加入125ml水混匀
常规HE染色中分化液的配制()A、75%乙醇95ml加5ml盐酸B、无水乙醇99ml加1ml盐酸C、75%乙醇99ml加1ml盐酸D、50%乙醇95ml加5ml盐酸E、无水乙醇95ml加5ml盐酸
单选题下列哪种溶液适用于大规模防癌普查的固定液?( )A95%乙醇溶液B75%乙醇溶液C氯仿乙醇溶液D乙醚乙醇溶液E卡诺固定液