- - tubes;
- - heater;
- - silver nitrate;
- - wire;
- - filter paper;
- - forceps or tweezers.
In order to determine the qualitative composition sodium chloride , you must choose the laboratory glassware (tubes) and heater with an open flame.This can be a spirit lamp or torch.Besides wire required, filter paper and reagents.
Qualitative reaction with sodium.Take the filter paper soaked in a solution of its sodium chloride and dry.Repeat these steps several times, the concentration of sodium ions became longer, ensuring the accuracy of the experiment.Grab the resulting sample with tweezers or forceps
and make the crucible into the flame of a spirit lamp or torch.The usual color of the flame change its color to bright yellow.This indicates the presence of sodium in conjunction .
You can do a little differently, namely without the use of paper.Take a wire, one end of a small loop bend and calcined it in the flame.Lower the loop to the solution sodium chloride , then fill it in the flame of a heater.As a result, the experience will be a bright yellow color of the flame, which is a high-quality response to sodium.
Qualitative reaction to the chloride ion.Take any soluble silver salt, since it is the interaction of silver ions with chloride ions precipitate occurs.The solubility of the salts can look at the table of solubility.The best option is to use silver nitrate.Pour into a 2 ml vial sodium chloride and gently add 2 ml of silver nitrate solution.The reaction immediately fall white precipitate of silver chloride , the presence of which indicates the presence in the test solution chlorine ions.
When performing experiments required to follow safety rules, especially a heater.
When working with silver nitrate is desirable to use a dressing gown for laboratory work.Otherwise, at clothes can be caught drops reagent spots from which derive almost impossible.