Lime water is the usual term for a saturated aqueous solution of calcium hydroxide. Lime water contains 0,15 to 0,17 percent of calcium hydroxide Ca (OH) 2 and is alkaline (pH = 13).
Lime water – obtaining
Lime water is obtained in several ways. One of the most frequently used methods is its two-stage acquisition. Powdered calcium oxide should be poured with water in a mass ratio of 1: 1 and mixed thoroughly. As a result of the exothermic reaction, calcium oxide reacts violently with water, releasing heat. The suspension obtained in this way is left for XNUMX hours to obtain complete sedimentation (settling) of the undissolved compound, after which the solution is decanted from the sediment and the sediment is poured over with another portion of water. The purpose of preparing the first solution is to remove the readily water-soluble KOH that exists as calcium oxide impurity. After pouring the second amount of water into it, the suspension is allowed to stand again. It is also stored in this form. Lime water decanting from above the sediment. It is almost colorless and only becomes cloudy after boiling.
Lime water – application
Lime water has wide application. In laboratories, it is used for carbon dioxide detection. Dissolved calcium hydroxide reacts with carbon dioxide to form sparingly soluble calcium carbonate causing the solution to become cloudy. In water treatment processes, it is used as a stabilizer and a binding agent for dissolved CO2, which can cause corrosion. But thanks application decarbonization or lime-sodium methods can be used to soften water.
Lime water she also found application in medicine. Lime water shows properties astringent, antiseptic, neutralizes acids, as well as drying and anti-inflammatory. It is used to care for seborrheic skin, with hives, erythema, skin inflammation and ulceration. Lime water it is also used to constrict dilated blood vessels in the skin, reducing the permeability of blood vessels. May help in the treatment of rosacea. It also reduces enlarged pores. Lime water it is sometimes used as a component of compresses used to treat allergic eczema, skin swelling, and to neutralize acid venom of insects and arachnids. Consumed also supported the treatment of diarrhea and inflammation of the bladder and renal pelvis. It also proved to be useful in responding to diabetic acidosis. On the other hand limestone water when mixed with linseed oil, it has been used to aid in the treatment of burns, inflammation or swelling of the throat. Whereas water limestone combined with milk, it supported the treatment of peptic ulcer disease and hyperacidity.
However, please note that to internal use, it can only be used on medical indications.
Lime water – precautions
Lime water is intended for application in adults and children over 12 years of age. Multiple application it can cause irritation and allergic reactions in sensitive people. With her application protect your eyes. You shouldn’t use lime water in a closed dressing. It should also be avoided application her on large areas of skin. The preparation should be stored at a temperature below 25 ° C, out of the reach of children. Water limestone you shouldn’t use after the expiry date.