Chemistry
Give reasons for the following:
In the laboratory preparation of nitric acid, the mixture of concentrated sulphuric acid and sodium nitrate should not be heated very strongly above 200°C.
Related Questions
In the preparation of nitric acid from KNO3, Concentrated hydrochloric acid is not used in place of concentrated sulphuric acid. Explain why.
Conc. nitric acid prepared in the laboratory is yellow in colour. Why? How is this colour removed?
(a) Nitric acid cannot be concentrated beyond 68% by the distillation of a dilute solution of HNO3. State the reason.
(b) What is passive iron? How is passivity removed?
Name the products formed when:
(a) carbon and conc. nitric acid is heated,
(b) dilute HNO3 is added to copper.