If necessary, protect non-glass surfaces of an overhead projector with clear plastic. Dip one Q-tip into concentrated hydrochloric acid (HCl) and a second cotton swab into concentrated aqueous ammonia ...

Prolonged exposure to 5 % HCl significantly impacts SS 304's microstructure and mechanical properties, emphasizing the need for effective corrosion protection.

The reactions can then be reversed with the addition of hydrochloric acid. The precipitate will reappear and then ... Add more NaOH until the hydroxide precipitate dissolves. Add HCl until the ...