Can potassium nitrate react with sulphuric acid?

Question

Can potassium nitrate react with concentrated/diluted sulphuric acid?

why?

Answer 1

最愛解答

Definitely there will be reaction among the concentrated sulphuric acid and potassium nitrate:

KNO3 + H2SO4 -> HNO3 + KHSO4

You will see brown fumes of Nitric Acid vapour (with nitrogen dioxide NO2) comes out of the reacting agents and potassium hydrogen sulphate remains.

For diluted sulphuric acid is used instead of concentrated, there will be no reaction.

資料來源： http://en.wikipedia.org/wiki/Sulfuric_acid