litmus test is a chemically treated litmus paper infusion.It is used to determine the degree of acidity or alkalinity.Prior to litmus paper impregnated steel, it was used alone as an indicator and the chemical reagent.For the first time used as an indicator litmus Spanish alchemist Arnaldo de Vilanova about 1300g.The substance of natural origin, it is derived from lichens.
litmus test - is an acid-base indicator, which in the acidic medium turns red, and alkaline - blue.Depending on the color intensity, using a special scale, determine the pH.The pH indicator or pH is a measure of the quantitative ratio in water of H + and OH- that are formed by dissociation of water.At room temperature in a neutral solution, pH 7, at acidic pH & lt;7, a basic pH & gt;7.
Litmus paper used in practice fairly easy way: you have to take it in one end and dipped in a liquid medium other.No need to drop the paper deep into the liquid.The result appears immediately: Wednesday lowered the edge of either changes color or not.Then, this paper is compared with standard values, which are deposited in the form of a tube or a scale on the package, which was an indicator.Litmus test is considered to be a universal indicator, asusing it can determine the degree and acidity and alkalinity.
This indicator can be made in the home, having spent a minimum of time and money.For this you will need a red, blue or purple cabbage, filter or regular white paper.Cabbage need to grate, boil for 30-35 minutes, then drain and squeeze gently.Cabbage itself will no longer need, and in the resulting broth to put strips cut from paper.After the paper is soaked, it is removed and dried.Keep this paper should be in a dry container, away from sunlight.By using this indicator should be considered a self-made, that it gives just a little more measurement error than the factory.
litmus test for its ease of use and flexibility in determining the pH has been widely used not only during the chemical experiments in educational and clinical laboratories, but also in everyday life.Thus, any person can easily using litmus paper, the pH value may identify any biological fluid, solutions, mixtures - saliva, urine, breast milk, water, soaps, etc.Parameters pH of body fluids is necessary to independently control in certain diseases.It is also a litmus test is widely used in the home growers to determine the degree of acidity and alkalinity of the soil.You can use it to determine the pH of cosmetic products, in particular those used for skin care, becauseIdeally they should be neutral.
