This is because oil and grease are non-polar, which means they will not dissolve in the water. Soap can mix with both water and with oil. Why? The soap molecule has two different ends, one that is hydrophilic (polar head) that binds with water and the other that is hydrophobic (non-polar hydrocarbon tail) that binds with grease and oil.
The other end is hydrophobic, and is more attracted to the molecules that make up oil and grease. When soap dissolves in water, the hydrophilic end bonds with water molecules, both dissolving the soap and reducing the surface tension of the water, forcing the water molecules apart and allowing them to soak into dirt and grime easier.
Therefore, soap can dissolve in oil. The "heads" of soap molecules, however, are hydrophilic and ionic in character. This allows them to dissolve in ionic and polar substances, e.g. water. When oily dirt is immersed in a soap solution, the tails attach themselves to the oil.
No.Only water and soap can be mixed together.Because,soap is the sodium or potassium salt of higher fatty acids.So,it will dissolve in water.Oil is an ester of glycerol with higher fatty acids and ...
The soap (in solution) still has the ability to also dissolve in oil. This allows the soap and oil to be washed away with the water, although ordinarily the oil and water would not intermix. 1 ...
Soaps and detergents act as an emulsifier, that helps bring oil and water together so that the dirt and grease can be easily rinsed away. When greasy dirt or oil is mixed with soapy water, the soap molecules arrange themselves into tiny clusters called micelles.
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The oil is a pure hydrocarbon so it is non-polar. The non-polar hydrocarbon tail of the soap dissolves into the oil. That leaves the polar carboxylate ion of the soap molecules are sticking out of the oil droplets, the surface of each oil droplet is negatively charged.
Water will be strongly attracted to the charged ends. Once the soap is attached to the oil droplet, it will dissolve in water because water surrounds it as it holds on to the sulfate ends (Roll cursor over image to see animation. Realize they wouldn't move one by one, but all at the same time).
Most acids do not dissolve oil because the two types of substances differ chemically. When mixed, the two form two separate layers as water and oil does. You can, however, dissolve one type of oil with another; depending on the oils, the two will make a smooth mixture. Soaps and other substances also dissolve oil, ...