CH3CH(OH)COOH
lactic acid (organic acid in sour milk)
H3PO4
phosphoric acid (mineral acid in anti-rust paint, fertilizers)
HNO3
nitric acid (mineral acid used in fertilisers and explosives!)
HCOOH
methanoic acid (organic acid in ant and nettle stings)
CH3COOH
acetic/ethanoic acid (the organic acid found in vinegar)
H2SO4
sulfuric acid (mineral acid in car batteries; also used in making fertilizer, paints, detergents)
C6H8O7
citric acid (organic acid in lemons, oranges, other citrus fruits)
H2CO3
carbonic acid (mineral acid in fizzy soft drinks)
HCl
hydrochloric acid (mineral acid used for cleaning, also found in stomach)