| you are: Definition of quality and naturalnosti wax
Definition of an impurity of stearin and paraffin by means of test Bjuhnera. In a chemical glass in capacity of 500 ml pour 100 sm3 of spirit then a glass place in a hot water bath. Then in spirit cautiously add caustic kaly in number of 28 g, carefully mix before its full dissolution. The sated solution put in a dark place and after upholding and cooling a solution merge in bank from yellow glass, then in a test tube place two slices of wax in weight 0,5-1,0 g, add 5 ml spirit an alkali solution, lead up to boiling over a spirit-lamp and boil 2-3 minutes If on all solution small fatty balls which after cooling gather for surfaces in the form of a fatty ring are formed, means, the examinee wax has an impurity of paraffin or tserezina. If wax is dissolved also a solution remains transparent impurity in it are not present. At analysis carrying out it is necessary to observe the big care, not supposing hit of drops of alkali on a skin of hands or clothes. At boiling of a solution it can be thrown out from a test tube, therefore at kipjachenii it hold an aperture from itself.
Definition of an impurity of stearin by means of limy water. In a glass test tube pour limy water and place wax shavings. A solution heat up to temperature of fusion of wax and thus test tube contents slightly shake up.
Solution Turbidity specifies in presence at the sample of wax of stearin.
Definition of an impurity of rosin by means of acetic anhydride. In a glass test tube or a flask pour a small amount of acetic anhydride, here place 1 g wax. A flask or a test tube heat up to wax dissolution, remove from fire and after solution cooling add in it one drop 63%-s' sulfuric acids. The red or blue-violet colouring of a solution passing in yellow-red colour, specifies in an impurity in rosin wax.
Definition of an impurity of stearin and fat with the help drills. In a flask pour 6-8 ml of the sated solution drills and place here 2 g wax. A solution boil 1 mines, cool. At the maintenance in wax of an impurity of stearin or fat the liquid looks like some dairy dregs. If the solution has slightly grown turbid also wax has emerged on its surface, means, the examinee the sample of wax the natural.
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