Question

How can we determine which compound was present in a container labelled KNO3 or K2CO3 or KNO2?

Answer 1

Explanation:

• The reaction of K₂CO₃ will vinegar solution ,  evolves carbon dioxide gas .

But the other two compounds KNO₃ and KNO₂ does not evolve carbon dioxide on reaction with vinegar .

• The reaction of KNO₂ with sulfuric acid gives , a brown gas , of nitrogen dioxide .

And the rest two compounds , K₂CO₃ and KNO₃  , does not react with sulfuric acid .