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In Latin it is where we can find the etymological origin of the reactive term that we will now proceed to study to find its meaning. It derives, in particular, from the word "reactivus", which is made up of three distinct parts:
-the prefix "re-", which can be translated as "backward".
-The noun "actum", which means "action" and which, in turn, emanates from the verb "agere", which is synonymous with "doing."
-The “-tive” suffix, which is used to indicate what a passive or active relationship is.

Reagent it is the adjective that refers to what generates a reaction . In the specific field of chemistry , a reagent is a substance that allows to reveal the presence of a different substance and that, through an interaction, gives rise to a new product.

The reagents, in short, are chemical elements that establish an interaction with other substances within the framework of a chemical reaction , generating a substance with different properties that is called product .

There are different kinds of reagents according to their characteristics, their reactivity, their use, etc. In this way, it is possible to talk about different reagents according to the context .

Specifically, we find three large groups of reagents, such as liquids, solids and preparations. However, we cannot ignore that there is also another classification that groups them into three:
-Reagents for analysis
- Very pure reagents, which have a higher degree of purity than those mentioned above.
-Special reagents, which are identified by the fact that they have specific qualities as they will be used to carry out very specific laboratory techniques.

The Grignard reagents , discovered by the French scientist Victor Grignard , are organometallic substances that react with electrophiles. Thanks to your finding, Grignard got in 1912 , he Nobel Prize in Chemistry .

He Millon reagent On the other hand, it is obtained by dissolving mercury in nitric acid. The chemical reaction allows to discover the presence of tyrosine in a solution since, before the appearance of this amino acid, a red spot is produced from the heating of a white clot.

Another important reagent is the Fehling reagent , which is used to determine the presence of reducing sugars (which keep the carbonyl group intact, which allows them to participate as reducers in a reaction).

The handling of reagents, as can be seen, is very important in the work of chemists. In all the labs , in one way or another, reagents are used on a daily basis.

In order to work in a comfortable, orderly, effective and efficient way in laboratories, it is common for reagents to be used to be properly labeled. Thus, elements such as their name and quality, the impurities they possess, wealth, density, pictograms, formula or even their molecular weight are included in that label. As for pictograms we are referring to the drawings that indicate their level of danger: corrosive, explosive, harmful, irritating, toxic ...

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