1. Almost Done Naming… Gasses, Acid Salts and Hydrates

2. Naming Gases Noble Gases (monoatomic) Example: He – helium gas Argon gas - Ar Diatomic gases (two atoms) I 2 – iodine gas Br 2 – bromine gas Cl 2 – chlorine gas F 2 - – fluorine gas O 2 – oxygen gas N 2 – nitrogen gas H 2 – hydrogen gas I Bring Clay For Our New House

3. Some compounds contain H 2 O in their struc-ture. These compounds are called hydrates. This is different from (aq) because the H 2 O is part of the molecule (not just surrounding it). The H 2 O can usually be removed if heated. A dot separates water: e.g. CuSO 4 5H 2 O is copper(II) sulfate pentahydrate. A greek prefix indicates the # of H 2 O groups. Hydrates sodium sulfate decahydrate nickel(II) sulfate hexahydrate Na 2 CO 3 H 2 O BaCl 2 2H 2 O Na 2 SO 4 10H 2 O NiSO 4 6H 2 O sodium carbonate monohydrate barium chloride dihydrate

4. Acid Salts An acid salt is formed when only some of the hydrogens are replaced by a metal Acid salts are named the same as neutral salts, however, the remianing acid hydrogen atom(s) are indicated by the word “hydrogen” (or dihydrogen, etc. as appropriate) inserted between the names of the cation and the anion. For example: Na + H 2 SO 4  NaHSO 4 (sodium hydrogen sulfate) Ca + H 3 PO 4  Ca(H 2 PO 4 ) 2 (calcium dihydrogen phosphate)

5. Practice Problems 1)Potassium hydrogen sulfate 2)LiHSO4 3)Li 2 HPO 4 4)ammonium hydrogen carbonate 5)sodium dihydrogen phosphate KHSO 4 Lithium hydrogen sulfate Lithium hydrogen phosphate NH 4 HCO 3 NaH 2 PO 4