Question

$H_{2}S{O}_4$ is used as pickling agent. Explain.

Answer 1

Pickling is a metal surface treatment used to remove impurities, such as stains, inorganic contaminants, rust or scale from ferrous metals, copper, precious metals and aluminum alloys. A solution called pickle liquor, which contains strong acids, is used to remove the surface impurities. It is commonly used to descale or clean steel in various steelmaking processes.

$H_2{SO}_4$ is a strong acid hence, used as pickling agent.