Hydration and Water of Crystallization Calculations
Chemistry ⇒ Stoichiometry and Chemical Calculations
Hydration and Water of Crystallization Calculations starts at 10 and continues till grade 12.
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A 2.50 g sample of hydrated salt loses 0.90 g upon heating. What is the percentage of water in the hydrated salt?
A hydrated salt has the formula CaSO4·xH2O. If 13.6 g of the salt loses 5.4 g of water on heating, calculate the value of x. (Ca=40, S=32, O=16, H=1)
A sample of hydrated salt has a mass of 7.50 g. After heating, the mass is 5.00 g. What is the percentage of water lost?
A sample of hydrated sodium carbonate, Na2CO3·xH2O, has a mass of 5.00 g. After heating, the mass of the anhydrous salt is 3.10 g. Calculate the value of x. (Na=23, C=12, O=16, H=1)
A student finds that 4.32 g of hydrated salt gives 2.16 g of anhydrous salt after heating. What fraction of the original mass was water?
A student heats 6.25 g of hydrated magnesium sulfate (MgSO4·xH2O) and obtains 3.00 g of anhydrous MgSO4. Calculate the value of x. (Mg=24, S=32, O=16, H=1)
A student heats 8.20 g of hydrated barium chloride (BaCl2·xH2O) and obtains 6.50 g of anhydrous BaCl2. Calculate the value of x. (Ba=137, Cl=35.5, H=1, O=16)
Calculate the formula of a hydrated salt if 5.00 g of the salt loses 1.80 g of water on heating, and the anhydrous salt is Na2CO3 (Na=23, C=12, O=16, H=1).
Calculate the mass of anhydrous CuSO4 obtained by heating 12.5 g of CuSO4·5H2O. (Cu=63.5, S=32, O=16, H=1)
Calculate the mass of water lost when 10.0 g of FeSO4·7H2O is heated to constant mass. (Fe=56, S=32, O=16, H=1)
Calculate the number of moles of water in 9.0 g of MgSO4·7H2O. (Mg=24, S=32, O=16, H=1)
Calculate the percentage by mass of water in CuSO4·5H2O. (Relative atomic masses: H=1, O=16, S=32, Cu=63.5)
Calculate the percentage by mass of water in MgSO4·7H2O. (Mg=24, S=32, O=16, H=1)
Describe a method to determine the number of water molecules in a hydrated salt experimentally.
Describe the difference between a hydrated and an anhydrous salt.
Explain why heating a hydrated salt causes a decrease in mass.
Explain why some salts change color when they lose water of crystallization.
Explain why the mass of a hydrated salt decreases when it is heated.
What is meant by the term 'water of crystallization' in a hydrated salt?
