How to remove a stain?

Published April 14, 2018

How to remove a stain?

How to remove a stain if you are dirty? And do you know that during chemical cleaning and stain removal, processes such as extraction, oxidation, reduction and adsorption are most often used? Of course, it is not worthwhile to spoil clothes for the sake of experiments. Let's do this: we'll prepare several pieces of light fabric, put different spots on it and try to remove them...

Caffeine from tea

Published April 14, 2018

Caffeine from tea

What substance in tea raises vitality and invigorates? It's about caffeine (this substance was first found in coffee beans). How can I get caffeine from tea at home? Strictly speaking, there are several tonic substances in tea - vitamins, essential oils, etc. But the leading role belongs to caffeine, from the class of alkaloids...

Carbohydrates

Published April 14, 2018

Carbohydrates

Carbohydrates are the foundation of our food. For example, glucose, fructose, starch, and cellulose are formed continuously in plant and animal cells. They are the most important energy material for the body. Carbohydrates possess common properties. This allows you to detect carbohydrates, even in very small quantities. Color reaction Molisch is a beautiful way of their recognition...

Corrosion protection

Published April 14, 2018

Corrosion protection

Surprisingly, plants contain organic compounds which can protect the metal from corrosion. So-called protection against corrosion is made possible by a specific processing stems, bark, fruit and leaves of a plant. How, then, comes the corrosion protection? Imagine that bulky steel part must be cleaned of rust. Therefore, the chemical method is needed, for example, acid etching...

Tannin from tea

Published April 14, 2018

Tannin from tea

We have already allocated caffeine from tea. It turns out that tea can also provide tannin. It is a mixture of substances that are used for tanning leather, etching tissues before dyeing, in medicine - as an astringent; remember the astringent taste of strong tea. Tannin from tea can be obtained in the school chemical laboratory, but for industrial purposes...

Homemade indicators

Published April 14, 2018

Homemade indicators

The nature of the chemical reaction, as is well known, mostly depends on the acidity of the medium. The behavior of substances also depends on this property. Therefore, chemical laboratories use indicators for the determination of certain substances. Indicators can not always be bought, then we will try to prepare homemade indicators...

Page ‹‹ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 ››

Tools