What is the behavior of soap in grease and acidic solutions?
First let’s classify grease and acidic solutions. Grease, is of course oily and non-polar, an acid(i.e. HCL) is polar(not all acids are polar). The acid and grease will not mix together, just like oil and water, now if you add soap, soap will act as an emulsifying agent, example, you are to mix an acid and grease in a test tube, they wont mix! but if you add soap, there will be a portion where in the grease and acid will mix (commonly at the point where acid and grease meet) they will mix because of the soap, it acted as an emulsifying agent. Note: only soap can do this, detergents can’t.
