Water – the most valuable and extended on the earth product which importance is still not estimated on - to advantage. From the formal point of view, this chemical in the form of transparent liquid, in small volume not having color and under normal conditions – a smell and taste. 71% of the Earth's surface are covered with water, but every day water introduces more and more riddles in our life.
Water – excellent high-polarity solvent. In wildlife to find clean, without impurity water – distilled – it is impossible. If water contains not in a laboratory test tube of the British scientists – in it there will always be gases and salts. Same treats also tap water – that that flows from any crane. Water happens several types, but at the household level it can be divided into soft and rigid. The softness of water depends on the ions of calcium and magnesium dissolved in it. In their soft water least of all, and because and soap in it foams better, and laundry detergent is well dissolved, and liquid for washing of ware is washed away easier. Rigid water has no such qualities, but at physical impact itself can foam. For example, when boiling or strong agitation. For softening of water it is recommended to be boiled, in this process the main thing is to remove often foam and to filter a deposit. By the way, it is important to note that hardness of water - size changeable. For example, at superficial sources it significantly fluctuates within a year. Here the rigidity is maximum at the end of winter and is minimum in the period of a flood. In underground waters the rigidity usually higher and changes less within a year. A deposit – one more sign of rigid or at all not drinking water. As it was mentioned above, at tap water there are always ions of bivalent metals, for example, of calcium or magnesium and also a hydrocarbonate ions. When water is heated, between these substances there is a reaction, and on walls of a vessel the deposit which sometimes and detergents cannot be washed away is formed. It is also the well-known scum which in language of chemists is called a carbonate. However, even soft water can foam, and the reasons for this purpose there can be great variety. For example, the high content of organic matter can become the reason of foam. In that case it is necessary to inquire in the municipal government of improvement or the operator of networks of a water utility about that how long the water supply pipes brought to your building changed. Perhaps, a problem and in the pipes which are carried out on the apartment. One of signs of high content of organic chemistry in water (permanganate oxidability – more than 5 units) is its not especially pleasant smell. If water from under the crane foams all colors of the rainbow - it is a good incentive screwing up the crane and to buy up large bottles with water in the nearest shop. Color bubbles – sign of availability of oil products in water what, certainly, is unacceptable for drinking liquid. If color foam from under the crane does not stop, then without participation of the city authorities such problem will manage to be solved hardly - it is a problem at the level of a water intake. Water can foam also in connection with high concentration of soluble solid substances that leads to increase in a superficial tension and interferes with an exit from water of steam and gases. Such foam can be seen when opening a bottle with mineral water. At last, water can foam because of a high pH value – that, advertized pH. The pure pH value is equal 7.0, and already at an indicator more than 13 of water turn out caustic alkalis. If water in your crane foams – do not hesitate to make with it plain experiments, but at the first fears call experts – only the chemical analysis will be able to give the exact answer to a question of origin of foam in, apparently, drinking water.