To precipitate the soap as soap is less soluble in brine
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Sodium chloride solution is added during soap processing to increase the hardness of the soap and help separate it from other components in the mixture. It also helps improve the clarity and texture of the soap by promoting proper saponification.
To determine chloride in soap, you can use a method called titration where a known volume of soap solution is titrated with a silver nitrate solution until a white precipitate of silver chloride forms. The amount of silver nitrate used can then be used to calculate the concentration of chloride in the soap.
Compounds like sodium chloride (salt) or glycerin may be added to increase the weight of soap. These additives help to make the soap harder and increase its density, resulting in a heavier final product.
The ingredients in Ivory soap typically include sodium tallowate, sodium cocoate or sodium palm kernelate, water, sodium chloride, sodium silicate, and fragrance.
Maja soap typically contains ingredients such as sodium palmate, sodium cocoate, water, glycerin, fragrance, titanium dioxide, and sodium chloride.
When hydrochloric acid reacts with sodium hydroxide, they neutralize each other to form water and salt. The soap will not directly participate in the chemical reaction but may be affected by the change in pH caused by the acid-base reaction.