Chemical reagents are pure substances or their mixtures, which are used for scientific, research and laboratory work, including in school chemistry classrooms.
In fact, the necessary laboratory reagents can be bought at any pharmacy. But in order to purchase really high-quality reagents for the laboratory, and even in the quantities needed by the school, we suggest studying this topic in more detail. So: what are chemical reagents, how are they classified, and what safety standards should be followed when conducting school practical classes?
Types of reagents for the laboratory
The internationally accepted classification of reagents is as follows:
Reagents are most often classified according to their purpose:
organic solvents - to change the structure or give additional properties to various substances;
chemical indicators - for visual determination of the concentration of various elements;
analytical reagents - for conducting various experiments, analyzes and composition values.
By purity, you can buy pure chemicals (98.0% of the main component), chemically pure, pure for analysis, purified. There are also technical products (from 70%) packaged in small containers. And there are drugs of special purity - they are used only in cases where even the smallest fraction of an impurity is unacceptable. But such practical exercises are carried out in areas that study quantum electronics or radio electronics, and not in school lessons.
Safety Precautions When Using Reagents
Almost all chemicals are flammable or explosive, some are poisonous or toxic. And even if the reagent is conditionally neutral, this is still not considered an indicator of its safety. Therefore, when working with them, strict precautions must be observed:
For experiments, use only special laboratory glassware and high-quality equipment.
Be sure to use the necessary protective equipment to avoid skin contact: gloves, mask, etc.
Make sure the desks in the lab are at the recommended safe distance.
The chemistry teacher should pay close attention to maintaining order in the classroom. Do not leave children unattended during any practice using laboratory reagents.
Another important condition for the correct use of reagents is their storage in the correct conditions.
How to store chemicals
The method of storage of reagents depends on their type, each of which has well-defined conditions for safe operation. Liquid or solid flammable reagents, oxidizing or spontaneously combustible reagents, low-hazard or non-hazardous reagents all require different conditions.
A common requirement for all is the presence of a label with the name of the substance and its formula, indicating the mass of the reagent, the degree of purity of the substance, its expiration date and production batch number.
Rooms where reagents are stored should be well ventilated. It is also necessary to take care of the presence of light-protective curtains on the windows - do not allow direct sunlight to hit the containers with reagents.
Where to get chemicals
Sometimes we hear that teachers turn to pharmacies and research laboratories to purchase chemicals for the school. This approach is not entirely correct. It will be much easier to contact a specialized supplier of school equipment - it will definitely have everything you need for laboratory tests in its arsenal.
This way you can choose and buy chemicals much easier: the replenishment process will not take you much time. After all, in school goods stores you can buy reagents for the laboratory both individually and as part of a ready-made set of chemical reagents at the following link https://b-pro.com.ua/ru/katalog/kabinetipodklyuch/kabinethimii
What is more profitable? Depends on the quality of the set. If they just put a couple of reagents there from all that is available in the warehouse, then it is better to do the selection yourself. And if the kit was compiled by specialized methodologists and practicing teachers, then it is more profitable to prefer a ready-made solution. After all, they have already selected for you the right amount of all the necessary reagents for conducting laboratory tests in accordance with the approved school curriculum in chemistry. You no longer have to face the problem of shortage or sudden absence of the necessary components right during the lesson.