Question

Are there any example for weak acids?

Answer 1

Carbonic acid, Acetic acid, Oxalic acid.

Answer 2

Weak acids are the acids which have a little concentration of H+ ions.
There are may weak acids. Here are the list of ones that I know:

1) Formic acid
2) Acetic acid 
3) Tannic acid
4) Oxalic acid 
5) Lactic acid

Hope this helps....