A test tube with side arm is a kind of laboratory glassware. It has a side arm installed on the basis of an ordinary test tube. A sealed test tube with side arm is equivalent to an ordinary test tube with a single-hole stopper. In the laboratory, when common gases react with liquids simultaneously through multiple test tubes with side arms, the chemical changes occurring between the liquids and the gases can be clearly observed, so that the chemical properties of the gases can be determined. Besides these basic functions, test tubes with side arms can also be used in many chemical experiments, especially when the reactants change from solid to liquid, the reaction process does not require heating, and a small amount of gas is to be produced. And carrying out such micro-experiments with the help of test tubes with side arms is precisely where the advantages of test tubes with side arms lie. For example, experiments such as both sodium carbonate and sodium bicarbonate can react with hydrochloric acid to release carbon dioxide.
Compared with other complicated laboratory supplies, test tubes with side arms have the advantages of being convenient to use, having a simple setup and achieving good results.
General sizes for test tubes with side arms for reference:
The mostly used test tubes with side arms are with upper side arms or lower side arms, optional side arm stopper.
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