Writing formulas and naming acids How do we

Writing formulas and naming acids How do we name acids?

How do we identify an acid? • Formulas: • You can recognize a formula as an acid by looking at what element it starts with. If it starts with Hydrogen, it is an acid • The only exception is H 2 O, which is water • Names: • If the name has “acid” in it, it is an acid

Naming acids A way to remember your endings is “I ATE something and it was ICky” and “my throat hurts; I have tonsil. ITE-OUS” Binary Compounds Ternary Compounds • This is a compound with only two elements in it • To name these you must: • This is a compound with three or more elements • To name these you must: 1. Start the name with “hydro” 2. Write the name of the second element but instead of adding “ide” at the end, you will end it with “ic” Example: HCl = Hydrochloric Acid 1. You DO NOT need to start of the name with “hydro” 2. Look at table E for the name of the polyatomic ion and change the ending according to this key: Ate ic ite Ous Example: H 2 SO 4= Sulfuric Acid NOTE: always add the word “acid” at the end of your acid’s name

Writing formulas for acids Binary compounds Ternary compounds • If your compound starts with the • If your compound does not start word “hydro” it only has 2 with the word “hydro” it means elements in it the other part of the formula is found on table E • The other element will be found on the periodic table • Remember your endings (ic ate; ous ite) • Example: Hydrofluoric acid= HF • Example: Chloric Acid= HCl. O 3 NOTE: be sure to check your oxidation numbers when writing your compounds; if they do not add up to zero, you must cross them

SPECIAL NOTE • The only exception to the rules is anything with the element “sulfur” in it (S, SO 4 and SO 3) • When naming these compounds, keep the entire name “sulfur” and add -ic or -ous to the end of it when appropriate: • H 2 S = hydrosulfuric acid • H 2 SO 4 = sulfuric acid • H 2 SO 3 = Sulfurous acid