Write the equation for the lab. preparation of HNO₃ from potassium nitrate and conc. H₂SO₄

Below is the equation for the lab. preparation of HNO₃ from potassium nitrate and conc. H₂SO₄:

$\underset{[conc.]}{\text{KNO}$3} + \underset{[conc.]}{\text{H}2\text{SO}4} \xrightarrow{\lt 200 \degree\text{C}} \underset{[acid \space salt]}{\text{KHSO}4} + \text{HNO}_3