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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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.
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)
Which of the following best describes a hydrated salt? (1) A salt containing water as a solvent (2) A salt with water molecules incorporated in its crystal structure (3) A salt dissolved in water (4) A salt that reacts with water
Which of the following is a hydrated salt? (1) NaCl (2) CuSO4·5H2O (3) KNO3 (4) CaCO3
Which of the following is NOT a property of hydrated salts? (1) They contain water molecules (2) They are always colorless (3) They can lose water on heating (4) Their formula shows water of crystallization
Which of the following is the correct formula for hydrated barium chloride containing two water molecules? (1) BaCl2·2H2O (2) BaCl2·H2O (3) BaCl2·4H2O (4) BaCl2·6H2O
Fill in the blank: The chemical formula for hydrated calcium chloride with six water molecules is __________.
Fill in the blank: The empirical formula of a hydrated salt is determined by finding the simplest whole number ratio of __________ to water.
Fill in the blank: The formula for hydrated iron(II) sulfate with 7 water molecules is __________.
Fill in the blank: The mass of anhydrous salt left after heating 15.0 g of FeSO4·7H2O is __________ g. (Fe=56, S=32, O=16, H=1)
True or False: Anhydrous salts contain no water of crystallization.
True or False: The color of a hydrated salt may change when it becomes anhydrous.
True or False: The formula MgSO4·7H2O indicates that there are 7 water molecules for every formula unit of magnesium sulfate.
True or False: The formula of a hydrated salt always includes a dot (·) before the water of crystallization.
