Chemistry Forum

Posted: **Mon Oct 16, 2017 10:02 am**

why are different forms to solve chemical equations?
Example:

Form 1:
NiS + HNO₃ = NiNO₃ + HS

Form 2:
NiS + 4 HNO₃ = Ni(NO₃)₃ + NO + S + 2 H₂O

Posted: **Mon Oct 16, 2017 10:53 am**

The first equation is wrong

It shoud be NiS + 2 HNO₃ = Ni(NO₃)₂ + H₂S

The second is ok.

The difference between the equations is because depending of the concentration of nitric acid. It works as oxidiser in highrt concentration. Ni₂+ goes to Ni₃+. and Sulfide will go to sulphur. Nitrate itself is reduced to Nitrogenoxide.

Posted: **Thu Oct 19, 2017 11:15 am**

Thanks!