Sodium tetraborate (borax)

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Sodium tetraborate (borax)

 

Tetraborate sodium ("borax") — Na2B4O7, sodium salt of boric acid, the most common and used compound of boron forms several of the crystalline, widely used in industry.

There are many minerals containing sodium tetraborate. These include:

• Borax or tinkal or borax, a mineral composition Na2B4O7•10H2O — debugIdrath of sodium tetraborate.

• Kernit — TetraIdrath of sodium tetraborate — Na2В4О7•4N2O.

• Numerous mineral class of borates, in addition to oxides of sodium and boron are contained other metals like calcium, magnesium, iron, etc.

• Crystalline compounds fall in the precipitate in the drying of some closed, seasonal, intermittent, salt lakes, for example lake Surls is located in the Mojave desert in the USA and some lakes in Turkey.

 

Forms several crystalline hydrates with different water content. These crystalline and tetraborate anhydrous sodium Na2B4O7 commonly called "borax". Examples crystalline hydrates:

• Pentahydrate (Na2B4O7•5H2O), the so-called "jewelry drill", is used in soldering jewelry.

• Decahydrate (Na2B4O7•10H2O).

 

However the most common "brown" is called decahydrate Na2B4O7•10H2O. This salt is a transparent crystals, when heated above 400 °C loses crystallization water.

So how is the salt of a weak acid and a strong base in water is hydrolyzed, an aqueous solution of tetraborate sodium has an alkaline reaction.

Interacts with strong acids, forming the corresponding salt and boric acid.

Tetraborate sodium is used:

• in the manufacture of enamels, glazes, optical and colored glasses;

• when soldering and melting metals as flux;

• in the paper and pharmaceutical industry;

• production of construction materials as a component of antiseptic for the manufacture of cellulose insulation "Ecowool";

• as disinfectant and preservative means;

• for the preparation of buffer solutions;

• in analytical chemistry:

• as a standard substance to determine the concentration of solutions of acids;

• for the qualitative detection of oxides metals (color of pearls);

• in pictures — part slowly existing developers as a weak accelerating substance;

• as a component of detergents;

• as a component of cosmetics;

• as raw material for boron;

• as an insecticide in poisoned baits to destroy cockroaches.

 

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