用微型化学实验仪器做置换法测定镁的相对原子量

The Measurement of the Relative Atomic Weight of Magnesium Through Replacement by Using Microscale Chemical Laboratory Instruments

本文介绍了微型仪器“滴定分液两用管”测定镁原子量的方法,该法操作简单,可靠性强,有效地克服了用量气管(常量)和移液管(微量)测定时,因塞封管口引起管内外压力不等或塞封不紧密漏气的现象,以及量筒倒置收集气体时液体弯月面的读数不准问题,测定结果达到无机化学实验的要求.

In this essay is introduced the way of measuring the atomic weight of magnesium by means of micro - instruments , i. e. Titrimetric and Separating Tube. The simple and reliable operation meets the demand of inorganic chemistry experiment, avoiding gas leaking and pressure inequlity inside and outside the tube when the nozzle is stuffed by using burette or pipetter.Furthermore, it can also overcome the problem about the inexact reading of liquid crescent moon surface when collecting gas by putting cylinder upside down.