examples are the ff.
vinegar(ethanoic / acetic acid)
sodium hydroxide
sodium hydrogen carbonate (sodium bicarbonate/bicarbonate of soda
calcium carbonate(marble)
hydrogen peroxide(in hair dye)
iodine
sodium chloride(salt)
sodium acetate 8H2O(hand warmers)
potassium nitrate (saltpeter)
di-sodium tetraborate (borax)