How concentration of nitric acid can find?

Answer 1

I suggest you look up titrations. It's a type of chemical procedure meant to accurately measure the concentration of an unknown concentration of a specific chemical. They're mainly meant for acid base reactions, so you're fine; I think there's also a procedure for redox reactions.

They require some rather specialized equipment, and anywhere you can find that equipment, you should also be able to find a chemist (even a high school chemistry teacher) who is familiar with the procedure, which is far too complicated for me to describe without diagrams. It's a very precise method, too - my father used it as a major part of doctorate study, and even first year undergraduate students are expected to be able to produce small errors in very precise data - I had a chem lab where we measured concentration to 0.0001 M, and lost 5% of the lab mark for every 0.0001 M off what the prepared sample was.

Answer 2

The concentration of nitric acid can be determined by performing a titration with a known concentration of a base. By adding the base to the nitric acid solution until the equivalence point is reached, the concentration of the nitric acid can be calculated using the volume and concentration of the base. Alternatively, instrumental methods such as spectroscopy or potentiometric titration can also be used to determine the concentration of nitric acid.