How much hydrochloric acid is safe?

Answer 1

The hydrochloric acid is very corrosive and not safe; work with precautions - gloves, apron, protection glasses.

Answer 2

The safe level of hydrochloric acid exposure depends on the concentration, duration of exposure, and individual sensitivity. In general, exposure to concentrations of 0.5% or lower is considered safe for brief periods, such as household cleaning. Higher concentrations or prolonged exposure can be harmful and should be avoided.