What are the five basic acids??

Answer 1

You may also be talking about the different theories of what constitutes an acid, but try as I may, I can't remember 5 from way back in undergrad and grad chem. There are, of course, the most usually recognized type of acid, which is a protic acid, meaning it has one or more hydrogens that dissociate from the anion of the acid. Then there are Lewis acids, which are missing electrons instead of having protons. (In other words, instead of a positively charged proton, they are deficient in negatively charged electrons, whether they have a net charge or just an empty orbital where a Lewis base (which has a pair of unshared electrons) can contribute its pair. There are also "hard" and "soft" acids and bases, but that part's fuzzy after all these decades.

Finally, something you don't normally think of as an acid, such as acetone, can behave like one in the presence of an exceptionally strong base, such as potassium tert-butoxide. In the presence of an extremely strong base like butyllithium, even certain hydrocarbons may behave like acids.

I don't think I've answered your question, but I probably gave you more to think about than you were expecting!

(There is another kind that I remember from my hippie days in the 60's and early 70's, but that's a different subject altogether! It burned a hole in my genes.)

Answer 2

You may be talking about amphoteric substances, which can act as an acid or a base. H2O, for example, can gain or lose a proton or electron-pair (depending on which definition of acid you are going by). Some examples include H2O and NH3. Do a search for others.

If you're talking about common acids, then the guy above is probably right.

Answer 3

Basic acids ?????? Bases and Acids are completely opposite things.

The most common acids (school or college level) are

HCl, H2SO4, HNO3, HBr, CH3COOH