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 12

A hydrated salt has the formula MgSO₄·xH₂O. If 2.46 g of the salt loses 1.08 g of water on heating, calculate the value of x. (MgSO₄ = 120 g/mol, H₂O = 18 g/mol)

A sample of hydrated sodium carbonate (Na₂CO₃·xH₂O) weighs 10 g. After heating, the residue weighs 3.8 g. Calculate the value of x. (Na=23, C=12, O=16, H=1)

Calculate the percentage of water of crystallization in CuSO₄·5H₂O. (Atomic masses: Cu=63.5, S=32, O=16, H=1)

Describe the difference between efflorescent, deliquescent, and hygroscopic substances.

Describe the effect of humidity on efflorescent and deliquescent salts.

Describe the steps involved in the laboratory preparation of hydrated crystals of copper(II) sulfate.

Describe what happens when hydrated copper(II) sulfate is heated.

Explain the process of crystallization in the preparation of hydrated salts.

Explain the term 'deliquescence' with respect to salts.

Explain why anhydrous copper(II) sulfate is used as a test for water.

Explain why hydrated salts should be stored in airtight containers.

Explain why some salts do not form hydrates.

Explain why the formula of hydrated salts includes a dot (·) between the salt and water molecules.

State the importance of crystallization in the chemical industry.

State the role of water of crystallization in the structure of hydrated salts.

What is meant by the term 'efflorescence' in relation to hydrated salts?

What is meant by the term 'hydrated salt'?

What is the difference between a hydrated salt and an anhydrous salt?

A hydrated salt has the formula FeSO₄·xH₂O. When 4.90 g of this salt is heated, 2.70 g of anhydrous FeSO₄ remains. Calculate the value of x. (FeSO₄ = 152 g/mol, H₂O = 18 g/mol)

A student prepares a saturated solution of a hydrated salt at 60°C and allows it to cool slowly to 25°C. Explain why crystals form and describe the role of temperature in the crystallization process.