正确量取8.5mL的液体,应选用的合适仪器有( )             

正确量取8.5mL的液体,应选用的合适仪器有(  )                   

①5mL量筒②10 mL量筒③50mL量筒④滴管.                        

A.②               B.①④             C.③④             D.②④

答案

【分析】根据量筒的选取方法和量取液体的注意事项考虑本题.           

【解答】解:选取量筒时要选取比所量液体体积大,且最接近的,误差小,当加液体时,快到刻度时要改用胶头滴管,减小误差.                                                    

故选:D.                                                   

【点评】化学实验的基本操作是做好化学实验的基础,学生要在平时的练习中多操作,掌握操作要领,使操作规范.                                          

 

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