[eric2011 (OP)]

Hi does anyone know how can I extract  zinc metal from brass with acids and some salts at home? When I searched through youtube I found people dissolving brass in nitric acid. How and is it possible to add some metal salt to precipitate zinc?

Gracias

[Bored chemist]

Brass will dissolve in nitric acid.
The process will result in the production of toxic gases like nitrogen dioxide.

Eventually, you will have a solution of zinc nitrate and copper nitrate.

If you carefully add an excess of sodium hydroxide to that solution, you will get a solution of sodium zincate, and a precipitate of copper hydroxide.

Why do you want to?

[CliffordK]

How much time do you have?

Boats have a problem that salt water will leach zinc out of brass leaving a copper sponge behind. 

They also frequently use a zinc anode for galvanic corrosion, with the zinc anodes slowly being eaten away.

I would think you could speed up the process and improve recovery with a battery.

I may get it backwards...  but I think a zinc cathode connected to positive, and the brass connected to negative.  The salt may not matter a lot, although I think chloride salts are discouraged because they can release chlorine gas.  Thus NaOH, KOH, or perhaps an acid.

Over time you should get a similar copper sponge as one would get by using brass screws in a salt water boat, and the zinc would plate onto the positive

[Bored chemist]

In principle, you can distill the zinc out of molten brass.

[eric2011 (OP)]

I want to obtain zinc metal from brass

[Bored chemist]

Sell the brass; buy zinc.

[CliffordK]

Of course the easiest way to extract zinc from a US penny would be to get one made in the last 20 years and carefully sand off the outer layer of copper/bronze.