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- Liquid soap (a soap prepared with potassium hydroxide) cannot be turned in solid soap. It is prepared especially to be liquid.
- Melted soap (prepared with sodium hydroxide) can be solidified after adding a small quantity of sodium chloride and by cooling to room temperature.

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11y ago
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13y ago

The difference between a hard bar soap and a softer bar soap is the water content, and perhaps an additive like glycerin. To "convert" a hard bar soap into a soft bar soap, you essentially have to re-mill the soap. That'd be like taking a bar of hard soap, grating it into flakes, then adding a hint of water and/or glycerin, and then remolding the soap into a bar. The result would be a soft bar soap.

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Q: How do you turn hard bar soap into soft soap?
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Soap is partially comprised of fatty acids; long molecules derived from plant or animal fat. The liquid soaps use shorter, fats, which tend to be more liquid than solid (compare olive oil, for example, to palm oil). The above does not answer the question... The answer is that soft soaps tend to dissolve more readily into water, due to the ions of the soap being able to stabilise and disperse into the water. Hard soaps tends to have ions that make dissolution into water difficult. In other terms, soft soap dissolves easily, where as hard soaps do not. To add to this - soaps made with KOH (caustic potash) give more soluble soap molecules than those made of NaOH. Therefore KOH soaps are soft and are used for liquid soap production and NaOH soaps are hard.


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