He Water It is an insipid, odorless and colorless substance whose molecules are composed of two hydrogen atoms and one oxygen atom. It is an indispensable element for the development of life. Something hard On the other hand, it is not soft, exerts resistance or is rough.
It is known as hard water to the one that hinders the development of foam when in contact with soap, because it has a high amount of bicarbonates and magnesium and calcium carbonates . To calculate the hardness of water, the concentrations of magnesium and calcium that are present in each liter of water are usually added.
The opposite of hard water is the soft water : the liquid that has a very small amount of mineral salts. When there is no mineral in the water (that is, when it is formed only by hydrogen and oxygen), there is talk of distilled water .
In addition to magnesium and calcium, water hardness is determined according to the amount of zinc, manganese or iron, among other cations (A cation is an ion whose electrical charge is positive, so it follows that it has suffered a loss of electrons; its state of oxidation is positive). According to World Health Organization (WHO), this value should be expressed in milligrams of substances equivalent to carbonate per liter of water; when it does not reach 60, then we are faced with soft water.
Water hardness can be permanent or temporary. In the case of permanent hard water , however much it is boiled, the magnesium and calcium chlorides and sulfates are preserved since, after reaching a certain temperature , its solubility begins to decrease.
He temporary hard water Instead, it can lose its hardness when calcium hydroxide is added or when it is boiled. This is because their carbonates can dissolve and, therefore, be eliminated.
It is important to know that hard water generates various problems . When hard water is used in clothes irons, heaters or heaters, washing machines or boilers, it is common for carbonates to be embedded in deposits and ducts. In this way, artifacts can get clogged and stop working properly.
Regarding the impact that hard water can have on our Health , the debate has not yet closed, since to deal with their detractors there are those who say that their consumption is key to meet the need that our body has magnesium and calcium. Some researchers point out that both positions have inconsistencies and lack of accuracy, so it is important to address the issue with an open mind and focus on the evidence before making a final decision.
Water hardness directly affects your organoleptic properties , that is, in all those parameters that we can use to describe their characteristics physical according to the perception that our senses have of them, among which are their texture, smell, taste, temperature and color.
WHO ensures that water whose hardness exceeds 200 mg / l it carries the risk of scale formation in deposits and pipes, while if it is below 100 mg / l Long term corrosion may occur.
Machines and pipes aside, there are experts who say that human beings can lead to the appearance of kidney stones, although none of the studies specifically conducted on this issue since 1984 have yielded scientific evidence to support the risks that many assign to hard water. The general tendency, however, is to avoid its consumption in children and people with urinary problems.