That's an interesting question. Soap contains some glycerin in it. Apparently glycerin is a byproduct of making soap, which can be removed or retained in the soap depending on the maker. Glycerin itself is not explosive. However, glycerin can be chemically modified and made into nitroglycerin (Can you guess how it's modified? The word gives a hint ... nitro-glycerin ... nitrates are added.), which is used in explosives. I hope that answers your question.

Here's the website I got the information from:

pioneer