The chemical reaction is:
ZnO + 2 HNO3 = Zn(NO3)2 + H2
Adding more HNO3 has no effect.
This depends on the reaction.
iron with concentrated nitric acid no reaction occurs becase of the iron passivity which is due to the oxidizing property of the acid were a layer of the metal oxide is formed which is complete and non porous so it protects the metal from further reaction
1-diluted : Fe+4HNo3ـــــــــــــــdilu. + heatــــــــــــ Fe(No3)3+2H2o+No 2-with concentrated no reaction occurs becase of the iron passivity which is due to the oxidizing property of the acid were a layer of the metal oxide is formed which is complete and non porous so it protects the metal from further reaction
Any reaction between nitric acid and ammonium nitrate.
Reduction-Oxidization (Redox) reaction
This is considered an acid/base reaction.
No reaction
6,96 g of nitric oxide are obtained.
2 Hg + 2 HNO3 = Hg2(NO3)2 + H2 (reaction with dilute nitric acid) Hg + 2 HNO3 = Hg(NO3)2 + H2 (reaction with concentrated nitric acid)
confusion
phosphoric acid
oxidation