Presentation on theme: "Hydrates (11.5) Hydrate- compound with a specific amount of water molecules bound to it."— Presentation transcript:
Hydrates (11.5) Hydrate- compound with a specific amount of water molecules bound to it
Hydrates are often used as drying agents or desiccators because they can absorb moisture Silica gel- used in electronic equipment packaging, cat litter
Chemicals that do not contain water in their structures are called anhydrous (without water) Hydrates are easy to spot because their formulas show the water molecules Anhydrous cobalt (ii) chlorideCobalt (II) chloride hexahydrate CoCl 2 CoCl 2 x 6H 2 O
To determine hydrate formula 1.Determine moles of water and of anhydrous compound 2.Find x = moles of water moles of anhydrous compound 3.Plug in x Formula for compound X H 2 O
A hydrate is found to have the following percent composition: 48.8% MgSO 4 and 51.2% H 2 O. What is the formula of the hydrate?
If g of CuCl 2 is heated, 9.25 g of anhydrous cobalt chloride remains. What is the formula for the hydrate?
A mass of 2.50 g of blue hydrated CuSO 4 x H 2 O) is placed in a crucible & heated. After heating, 1.59 g white anhydrous copper sulfate (CuSO 4 ) remains. What is the formula?
A mass of 2.50 g blue hydrated copper sulfate (CuSO4 x XH 2 O) is place in a crucible and heated. After heating, 1.59 g of copper sulfate remains. What is the formula for the hydrate?
What is the mole ratio of the hydrate CuSO 4 x ___H 2 O, if the anhydrous mass of CuSO 4 is 25.42g and mass of water is 14.3 g?
What is the mole ratio of hydrate Na 2 CO 3 x ____ H 2 O, if the original mass of the hydrated Na 2 CO 3 was g and the mass of the anhydrous Na 2 CO 3 is 16.19g?