Sodium chloride is added to precipitate the soap.
Sodium chloride is used to precipitate soaps from the solution.
It is possible that gelatine is used to make soap which comes from animals such as the pig.
Adding NaCl solution to soap mixture helps to precipitate out the soap, making it easier to separate from the rest of the solution. This process is known as salting out and helps concentrate the soap for further processing.
A solution of NaCl 1 M.
- as preservative- to improve the taste
The NaCl does not dissolve completely in the soap solution because the solution is saturated, meaning it has reached its maximum capacity to dissolve more NaCl. Any additional NaCl added will not dissolve and will remain as a solid in the solution.
it hardens the soap
In conclusion, soap preparation involves mixing fats or oils with a caustic substance, such as lye, to undergo a chemical reaction called saponification. This process converts the fats into soap and glycerin. The soap mixture is then allowed to cure and harden before it is ready for use.
Salting out is used in the preparation of soap to help separate the soap from the glycerin during the saponification reaction. By adding salt to the soap mixture, the soap molecules are forced to come out of solution, making it easier to separate them from the glycerin layer.
Two methods of preparation in laboratory:- 2 Na + Cl2 = 2 NaCl- NaOH + HCL = NaCl + H2O
It depends on the salt. A salt of calcium, magnesium, or iron will form an insoluble compound that will precipitate with a soap molecule that is known as soap scum. Here is a typical reaction: Ca2+(aq) + 2C17H35COO-(aq) ==> (C17H35COO-)2Ca2+(s) Sodium chloride will not form a precipitate with soap as long as the soap is a carboxylate.
Adding NaCl solution to the soap mixture helps to separate the soap from the aqueous solution. This process is called salting out, where the addition of salt reduces the solubility of the soap, causing it to precipitate out of the solution.