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Chemistry in Everyday Life — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryChemistry in Everyday Life1 Mark
MCQ
Sodium chloride is used in soap industry for soap's $.......$
  • A
    Decomposition
  • B
    Removal of hardness
  • ✓
    Precipitation
  • D
    None of the above
✓

Answer

Correct option: C.
Precipitation
The addition of salt $($sodium chloride$)$ to the crude form of soap forms fatty $-$ acid salts. The sodium ions from the sodium chloride bond with the fatty acid, forming a product that is less soluble in water.
Because of this reduced solubility, the soap leaves the solution and forms a solid mass. This process of "dropping" out of the solution is called precipitation.

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