Naming Hydrates:
Naming Hydrates CaSO 4 •2H 2 O (formula for the hydrate of calcium sulfate that contains 2 moles of water for every 1 mole of calcium sulfate) Name the compound Add the word hydrate, preceded by the numerical prefix for the number of water molecules present Calcium sulfate dihydrate
Name That Hydrate!:
Name That Hydrate! BaI 2 •2H 2 O NiSO 3 •6H 2 O Na 2 CO 3 •10H 2 O Barium iodide dihydrate Nickel (II) sulfite hexahydrate Sodium carbonate decahydrate Please pause the presentation and name the hydrate formulas shown. Then restart the presentation to check your answers.
Formula Mass of a Hydrate:
Formula Mass of a Hydrate NiSO 3 •6H 2 O Find the formula mass of the compound Find the formula mass of the water Add them together (138.7 u) (6 x 18.0 u = 108 u) (138.7 u + 108 u = 247 u)
Percent Water in a Hydrate:
Percent Water in a Hydrate Calculate the mass due to water alone Calculate the mass of the entire hydrate Divide the water mass by the hydrate mass Multiply by 100