|Class 12 Chemistry P Block Elements||Chemical properties of Nitric Acid|
Chemical properties of nitric acid
It keeps on oxidizing and forms nitrogen dioxide that is why we see brown color fumes coming out from the bottle.
Because this is acidic therefore, it reacts with base showing neutralization reaction:
HNO3 + NaOH ---> NaNO3 + H2O
Nitric Acid Sodium Hydroxide Sodium Nitrate Water
M + HNO3 ---> metal nitrates + [H]+
This nascent hydrogen can bring about reduction of substance:
Please note certain metals like chromium, aluminium do not dissolve in nitric acid due to formation of passive layer of oxide film on it which prevents further reaction.
Aqua regia: It is a mixture of nitric acid and hydrochloric acid in ratio 1:3 and it is used in dissolving noble metals.
I2 --- > IO3-
In this oxidation state of iodine is changed from 0 to +5 that is increase in oxidation number: