Advertisements
Advertisements
Question
Explain with the help of a balanced equation, the brown ring test for nitric acid.
Advertisements
Solution
Brown ring test -
Nitric acid in a test tube is taken and then 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.
\[\ce{6FeSO4 + 3H2SO4 + 2HNO3 -> 3Fe2(SO4)3 + 2NO + 4H2O}\]
\[\ce{FeSO4 + NO + 5H2O -> \underset{\text{Hydrated nitrosoferrous sulphate(brown ring)}}{[Fe(NO)(H2O)5]SO4}}\]
APPEARS IN
RELATED QUESTIONS
Name the products formed when dilute HNO3 is added to copper.
Ammonia is used in the Ostwald process.
Give the sources of reactants used in this process.
Name a metal nitrate which on heating is changed into metal oxide.
Name the Following:
Salt referred to as chile saltpeter.
What happens when (Given balanced equation) :
Sulphar is added to hot and conc. HNO3?
Complete and balance the following equation :
HNO3 + FeSO4 + H2SO4 → ______________
Name the compounds required for the laboratory preparation of nitric acid.
Dilute nitric acid is generally considered a typical acid except for its reaction with metals. In what way is dilute nitric acid different from other acids when it reacts with metals?
Why should the temperature of the reaction mixture of nitric acid not be allowed to rise above 200oC?
The figure given below illustrates the apparatus used in the laboratory preparation of nitric acid.
- Name A (a liquid), B (a solid), and C (a liquid). (Do not give the formulae.)
- Write an equation to show how nitric acid undergoes decomposition.
- Write the equation for the reaction in which copper is oxidised by concentrated nitric acid.
