Contains NaCl bound to seawater

Table salt

When salt is spoken of, it usually means table salt. Salt is one of the oldest Condiments of food. For us humans it is vital. For this reason, salt was already considered very much in ancient times precious.

In some regions, salt was even considered Means of payment used. It was nicknamed "White gold". This term for salt is still known today.

Did you already know, that ...

  • Sodium chloride or NaCl is the chemical name of table salt?
  • Salt is vital for our organism and our body would dry out without it?
  • pure table salt but is unhealthy in large quantities?

Emergence

In front 200 million years ago it was very hot on earth. The salty sea water started to faster evaporate. By so-called tectonic shifts (Displacement of the earth's crust) the sea floor was also bulged in some places. It so happened that parts of the sea were cut off. The salt content of the separated parts of the sea increased more and more due to the stronger water evaporation. Eventually the salt started to crystallize.

Than the little ones Sea basins dried up there was only that crystallized salt back in the indentations. The wind made the salt crust from sand and Covered in dust and was thus protected from rain, snow and hail.

Over the course of millions of years, the layers of salt became different Layers of rock covered. So it happens that today the salt deposits are often very deep in the earth. Incidentally, some of these rock salt layers are hundreds of meters thick.

composition

Sodium chloride is made up of two different elements: sodium and chlorine.

Sodium (Na) is a very soft, metallic sheen metal. It's reactive and quite common on Earth - sodium is sixth most common element the earth.

Chlorine (Cl) is actually a toxic, yellowish-green gas. It is also very reactive and occurs naturally only in compounds. In combination with sodium it is no longer toxic. Here it is bound to the sodium as chloride.

Sodium chloride has one Melting point at 801 (eight hundred and one) degrees Celsius, and be boiling point lies by 1,440 (one thousand four hundred and forty) degrees Celsius.

Occurrence

Sodium chloride occurs in nature very often in front.

Most of the salt is in dissolved form in the Oceans. When you try sea water, you notice that it tastes quite salty. If all the sea water evaporated and the salt were evenly distributed over the mainland, the crust would be thick 150 meters to have!

There is also salt under the earth. This here, in the Salt domes, occurring salt is Halite or Rock salt called.

If all the rock salt reserves on earth are added together, the deposits are sufficient for that next 450,000 (four hundred and fifty thousand) Years. So we don't need to worry that we will ever run out of salt, because that doesn't include the salt dissolved in the seawater.

Extraction

Table salt gets through won four different ways.

One way is through extraction manual extraction of rock salt in mines (of course with the help of different tools and machines). Probably the oldest salt mine is in Hallstadt, in the Salzkammergut. Here was already about 3,000 years ago started mining salt.

The mining of rock salt is cheaper Pumping in water in the underground storage facilities. The salt is in the water dissolved. Then the so-called "Brine“(Salt-water mixture) pumped up. After the water in the saline has evaporated, the salt remains.

On the coasts of the sea there are sometimes "Salt marshes“Or to see salt pans. These are flat, large fields filled with sea water. Due to the shallow depth and the large surface area of ​​the fields, the water evaporates relatively quickly. What remains is sea salt.

Sea water becomes too Drinking water made. The salt dissolved in it is also removed from the seawater. So salt is a here By-product.

use

Salt is essential for us humans. Our body also contains salt. About through sweat we lose some salt from our body every day. This has to be fed back into the body and that is best done through that Ingesting food - so eat.

But salt is not only used for Seasoning of dishes used, but also for Preserve (make durable) of food. Salt binds the water contained in food. This means that any bacteria and mold that may be present lose their nutritional basis. Cheese is also preserved with salt.

Table salt lowers the melting point of water. That is why salt is called in winter Road salt used. Snow and ice on the sidewalks and streets just melt away. However, the use of road salt must be carefully considered. Streams, plants and also animals suffer from it. In addition, road salt promotes the Rusting process on cars. This means that cars rust faster due to the salt.

Other uses of salt can be found in the medicine (Saline solutions) and in the chemical industry for the production of, for example Soda, chlorine and soaps.

miscellaneous