Acids and alkali's are corrosive materials with multiple uses, including cleaning products.
Acids include eg hydrochloric acid (HCI), hydrofluoric acid (HF), phosphoric acid (H3PO4), nitric acid (HNO3) and sulphuric acid (H2SO4)
Alkali's include sodium hydroxide (NaOH - caustic soda) and potassium hydroxide (KOH - caustic potash )
They can cause serious ill health mainly by:
1. Skin contact: acids and alkali's cause burns which are often slow to heal; and
2. Inhaling fumes or mist: concentrated solutions of acids and alkali's may give off toxic and corrosive fumes. Spray application produces a mist which may also be toxic and corrosive.
Reference
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