Examples of acids and alkalis
(see acids and alkalis)
Strong acids: Hydrochloric acid, sulfuric acid, nitric acid
Weak acids: Citric acid, found in lemon and lime juice; Ethanoic (acetic)  acid, found in vinegar.
Strong alkalis: Sodium hydroxide (caustic soda), found in oven cleaner.
Weak alkalis: magnesium hydroxide solution (milk of magnesia), found in indigestion mixture; ammonia, found in window cleaner.