Sulfate of sodium belongs to one of four classes of inorganic compounds – to salts. This colourless crystal substance representing the average salt consisting of two atoms of sodium and the acid rest. In solution the connection dissociates (breaks up) to particles – ions of sodium and sulfate ions, on each of which high-quality reaction is carried out.
It is required to you
- - sodium sulfate;
- - nitrate or chloride of barium;
- - test tubes;
- - spirit-lamp or torch;
- - wire;
- - filter paper;
- - nippers or tweezers.
Instruction
1. For recognition of components of this salt carry out two consecutive high-quality reactions. Thanks to one and them you will be able to define sodium, the second will show existence sulfate ions. The heating device, and with an open flame is necessary for definition of sodium (electric will not fit). Take a delay, make an eyelet on one end and calcinate it on a flame. It is necessary in order that the elements which are a part of a wire did not affect result and did not distort it. Then lower a wire in sodium sulfate solution then bring it in a flame. If there is a bright yellow coloring of a flame, then can state sodium presence.
2. It is possible to arrive a little differently. Take filter paper, place it in test solution, pull out and dry up. Repeat it several times that concentration of ions of sodium increased that will give more intensive coloring of a flame. By means of crucible nippers or tweezers bring a small piece of paper in a flame. Coloring change will also demonstrate availability of sodium.
3. To define sulfate ion, it is necessary to carry out on it high-quality reaction. Substance which part the barium ion surely is has to be reagent. For an experiment take, for example, chloride of barium and flow in a test tube to the studied solution. In capacity instantly there will be changes as the deposit of white color of sulfate of barium drops out. It is an existence indicator sulfate ions. The similar chemical phenomenon will be observed if for reaction you take also other salt containing a barium ion. The main condition that it was soluble in water that it is possible to recognize by the table of solubility of salts, acids and bases.