Hydration and Crystallization of Salts

Chemistry ⇒ Acids, Bases, and Salts

Hydration and Crystallization of Salts starts at 9 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Hydration and Crystallization of Salts. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.

See sample questions for grade 11

Describe the process of crystallization of a salt from its aqueous solution.

Describe the role of temperature in the crystallization of salts from solution.

Describe what happens to the structure of a hydrated salt when it is heated strongly.

Explain the difference between an anhydrous salt and a hydrated salt.

A sample of hydrated magnesium sulfate (MgSO₄·xH₂O) weighs 6.16 g. After heating, the residue weighs 3.00 g. Calculate the value of x (to the nearest whole number). (MgSO₄ = 120 g/mol, H₂O = 18 g/mol)

A sample of hydrated sodium carbonate (Na₂CO₃·xH₂O) weighs 14.3 g. After heating, the residue weighs 5.3 g. Calculate the value of x. (Na₂CO₃ = 106 g/mol, H₂O = 18 g/mol)

A student heats 5.0 g of hydrated copper(II) sulfate (CuSO₄·5H₂O) and obtains 3.2 g of anhydrous copper(II) sulfate. Calculate the mass of water lost during heating.

A student prepares a saturated solution of potassium alum (KAl(SO₄)₂·12H₂O) at 60°C and allows it to cool slowly to room temperature. Large, well-formed crystals are obtained. Explain why slow cooling is important in the crystallization process.

Which of the following best describes water of crystallization? (1) Water physically trapped between salt crystals (2) Water chemically bonded within the crystal structure (3) Water present as moisture on the surface (4) Water mixed with salt in solution

Which of the following is an example of a hydrated salt? (1) Sodium chloride (2) Copper(II) sulfate pentahydrate (3) Potassium nitrate (4) Calcium oxide

Which of the following is NOT a hydrated salt? (1) Na₂SO₄·10H₂O (2) CaCl₂·6H₂O (3) KNO₃ (4) FeSO₄·7H₂O

Which of the following is the correct formula for Epsom salt? (1) MgSO₄·7H₂O (2) MgCl₂·6H₂O (3) CaSO₄·2H₂O (4) Na₂SO₄·10H₂O

Fill in the blank: The blue color of copper(II) sulfate crystals is due to the presence of __________.

Fill in the blank: The chemical formula for washing soda is Na₂CO₃·__________H₂O.

Fill in the blank: The formula for gypsum is CaSO₄·2H₂O, which means it contains __________ molecules of water of crystallization per formula unit.

Fill in the blank: The green color of hydrated iron(II) sulfate is due to the presence of __________.

True or False: All salts are able to form hydrates.

True or False: The number of water molecules in a hydrated salt is always a whole number.

True or False: The process of crystallization can be used to purify salts.

True or False: The process of hydration involves the addition of water molecules to a salt.