Glassware are often used in various laboratories. Properly standardized use can reduce the life consumption of glassware and ensure the accuracy and precision of the experiment.
Different Glassware have different methods of use.
Cleaning work after the end of use is also very important . This article will introduce the use of three types commonly glassware in the laboratory and how to clean it.
Beaker
Glass Beakers are the most commonly used reaction vessels in the laboratory for liquids, configurating solutions, and simple chemical experiments. Although the beaker is of the same caliber, can not replace the cylinder to measure the liquid. In addition, because the direct flame heating of the bottom surface of the beaker may cause the container to burst due to uneven heating, it is not possible to directly burn the beaker using a flame when performing experiments requiring heating, but use an asbestos mat to heat the bottom.
For safety reasons, the amount of liquid inside the beaker should preferably not exceed one-third of the volume of the beaker to prevent the liquid from boiling out. A beaker without a lid is not a good choice for long-term chemical storage. When using glass rods to stir the solution, do not touch the bottom or the wall of the beaker while suspended inside.
Test tube
The test tube is a glass container containing a small amount of chemicals and a small amount of heating reaction. When placing a solid chemical in a test tube, do not drop it directly into the test tube to prevent the bottom of the test tube from rupturing. The solution should not exceed one-half of the volume, and the chemical should not exceed one-third of the volume during the heating reaction. The tube needs to be preheated and used with an external flame before heating. The tube is tilted 45°when heated and the outer wall of the tube is allowed to dry to avoid bursting of the tube due to uneven heating.
Volumetric flask
The volumetric flask is a slender neck, pear-shaped flat-bottomed glass container used to configure the solution. After the solution is dispensed, the solution must be drained using a glass rod. And the volumetric flask cannot be used to heat the solution.
If the solute is exothermic during solution configuration, wait for the solution to cool before transferring to avoid insufficient volume. Volumetric flasks should not be used to store solutions to avoid corrosion.
Common glassware washing method
Glassware may be contaminated with oil, rust or scale during the test. After the use of the glass instrument, it is necessary to carry out timely and clean to avoid the corrosion of the container, which may cause errors in the experimental results and reduce the service life of the glass container.
The glass container with the easily removed stains is rinsed with tap water first, then brushed with detergent, and finally rinsed with water. If the instrument wall can form a uniform film of water when the glassware is inverted, and the water is not left in the stock, the glassware is cleaned.
The glassware with oil stains is cleaned with an alkaline alcohol detergent first, then washed with soapy water, and finally washed with water.
Glassware with rust and scale should be soaked in hydrochloric acid washing solution first, then rinsed with tap water.
In the case the complicated glassware cannot be cleaned with a brush, it can be immersed in the washing liquid for a while and then cleaned with water.
Do not wipe the glassware repeatedly with your hands, paper or cloth after cleaning to avoid secondary pollution.
More ways to use glassware to click laboratory apparatus
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