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密度计算题的解答,具有一定的探究性和灵活性,只有弄清原理,掌握方法,才能思路清晰,从容作答.下面同学们来看看密度计算的常见类型及其解法.一、配制问题例1已知医院用的消毒酒精浓度为75%(100 g消毒酒精中含纯酒精75 g,纯水25 g).某学生用纯水与纯酒精配制的消毒酒精质量为180 g,体积为200 m L,假设混合后体积不变.这位学生配制的消毒酒精是否合格?若不合格应该怎么办?
Density calculation of the answer, with a certain degree of inquiry and flexibility, only to understand the principles, methods, in order to clear thinking, calmly answer below the students to see the common types of density calculation and its solution. 1 Known hospital disinfectant alcohol concentration of 75% (100 g sterilized alcohol containing 75 g of pure alcohol, 25 g of pure water), a student with pure water and pure alcohol sterilized alcohol quality of 180 g, a volume of 200 m L, assuming that the mixed volume unchanged. The student prepared disinfectant is qualified? If not how to do?