Making Shaving Soaps: The Art and Science Behind It
What are the key ingredients in shaving soaps used in barber-styling shops?
1) zinc oxide
2) acid
3) alkaline substances
4) astringent
Final answer: Shaving soaps in the barber-styling shop contain animal or vegetable oils, water, and what?
The key ingredient in shaving soaps used in barber-styling shops is 3. alkaline substances.
Alkaline substances are used to saponify oils and turn them into soap. Acids, on the other hand, would neutralize the soap and make it ineffective.
In the making of shaving soaps used in a barber-styling shop, animal or vegetable oils and water are indeed necessary ingredients. However, the third crucial ingredient is neither zinc oxide nor an astringent, but instead, 3. alkaline substances.
This is because shaving soaps are classified as a type of soap, which are salts of fatty acids. These are typically formed when animal or vegetable fats are treated with a base, such as potassium carbonate or sodium hydroxide, both of which are alkaline substances.
Soap molecules have both a hydrophilic (water-loving) and hydrophobic (water-avoiding) end. The alkaline substance helps to saponify the oils, transforming them into soap. The soap then entraps oils and dirt, allowing them to be washed away with water.
Acid is not involved in making soaps. Instead, acids would actually neutralize the alkalinity of the soap, reversing saponification and rendering the soap ineffective.