Advertisements
Advertisements
Question
Give two chemical tests for nitric acid.
Advertisements
Solution
Two tests for nitric acid are-
(i) Brown ring test :
Nitric acid in a test tube is taken and then freshly prepared ferrous sulphate solution is added. Concentrated H2SO4 is then added carefully down the sides of the test tube, dark brown ring is formed at the
junction of two layers.
\[\ce{6FeSO4 + 3H2SO4 + 2HNO3 -> 3FE2(SO4)3 + 2NO + 4H2O}\]
\[\ce{FeSO4 + NO + 5H2O -> \underset{\text{Hydrated nitrosoferrous Sulphate(brown ring)}}{[Fe(NO)(H2O)5]SO4}}\]
(ii) Nitric acid on heating gives brown fumes of nitrogen dioxide.
\[\ce{4HNO3 ->[\Delta] 2H2O + \underset{\text{Brown fumes}}{4NO2} + O2}\]
APPEARS IN
RELATED QUESTIONS
Write a balanced equation and name the products formed when zinc reacts with dilute nitric acid.
Why is freshly prepared ferrous sulphate solution used for testing the nitrate radical in the brown ring test?
Describe the Ostwald's process for the manufacture of nitric acid with labeled diagram.
How will you prepare Aqua regia from nitric acid?
What happens when (Given balanced equation):
Nitric acid is added to Kl (aq)?
Write a balanced equation for the production of nitrogen dioxide using copper.
State, what is observe when nitric acid is kept in a reagent bottle for a long time.
Write a balanced equation for following :
Laboratory preparation nitric acid.
Explain why nitric acid is kept in a reagent bottle for a long time.
Give a balanced equation for the following reaction:
Copper reacts with concentrated nitric acid.
