# Example of an reaction

1. Sep 25, 2004

### dg_5021

Does anyone know an example of a reaction which produces gas?

2. Sep 25, 2004

### chem_tr

Hello, all metals with oxidation potential higher than that of hydrogen produces gas when treated with an acid. For example, zinc is a good metal to produce hydrogen gas:

$$Zn+H^{+}\rightarrow Zn^{2+}+H_2$$

If you need nitrogen gas, then try this:

$$(NH_4)_2Cr_2O_7 + heat\rightarrow N_2+Cr_2O_3+~H_2O$$

For oxygen, you'll use hydrogen peroxide with acids on metal ions or any reducible substance:

$$(NH_4)_2Cr_2O_7~+~H_2O_2~+~HCl \rightarrow CrCl_3~+~O_2~+~NH_4Cl~+~H_2O$$

Also, ammonium salts give ammonia with heating with an alkali:

$$NH_4Cl~+~NaOH \rightarrow NH_3$$

As a last example, carbon dioxide can be produced from carbonates:

$$Na_2CO_3~+~HCl \rightarrow CO_2$$

I hope these are helpful. There are plenty more examples, but these were what I remembered quickly and wrote. You'll have to balance (and write the other unimportant products) for some reactions.

Last edited: Sep 25, 2004