“Salting out” experiment
How to extract sodium chloride from its solution
In this simple experiment you’ll find out about a process that is used in the production of soap!
Wear a protective mask, gloves and glasses and work in a well-ventilated room. Observe safety rules when working with concentrated acids.
Warning! Don’t try to repeat this experiment without a professional supervision!
Reagents and equipment:
- saturated sodium chloride solution (100 ml);
- concentrated hydrochloric acid (50 ml);
- 3 beakers.
Into the saturated sodium chloride solution, pour concentrated hydrochloric acid. Watch a white sediment precipitate – sodium chloride.
When solutions of sodium chloride and hydrochloric acid are mixed, sodium chloride precipitates. This is because hydrochloric acid creates an excess of chloride ions in the solution. The “surplus” chloride ions leave the solution and take the sodium ions with them. This process is called salting out. This method is used for purifying, extracting and separating substances.