I noticed that there are words "dissoluble", "dissolute", and "soluble", "solute". In one word, the terms with "dis-" and without "dis-". What is the difference between them?
Dissoluble means soluble? What a country.
They do mean the same thing, except that dissoluble is not in common use whereas soluble is. I would suggest that in scientific and academic circles you use the term soluble to claim that something can be dissolved. In a more casual setting, dissoluble would be alright.
A second note is that "soluble", if you don't specify, usually means "water soluble." I'm not sure if this same assumption exists for dissoluble.