Same chapter3 marksDifficulty: Medium
Why is concentrated sulphuric acid not used in place of dilute hydrochloric acid to prepare hydrogen sulphide from iron(II) sulphide?
Study of Acids, Bases and Salts
3 marksDifficulty: Medium
What is meant by water of crystallisation? Give two examples of hydrated salts with their formulae.
Original Khojo Papers practice question — not from a past board paper.
Answer
Water of crystallisation is the fixed number of water molecules chemically combined with each formula unit of a salt in its crystalline form. Copper sulphate crystals are CuSO4·5H2O and washing soda is Na2CO3·10H2O.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
On heating, a hydrated salt loses this water and becomes anhydrous, usually with a change of colour.
Related questions
From the same topic and chapter, at a similar level.
Same chapter3 marksDifficulty: Medium
Name three methods by which a soluble salt can be prepared, giving one equation for each.
Study of Acids, Bases and Salts
Same chapter3 marksDifficulty: Medium
Name the four types of salts and give one example of each.
Study of Acids, Bases and Salts
Same chapter3 marksDifficulty: Medium
Distinguish between a strong acid and a weak acid, giving one example of each.
Study of Acids, Bases and Salts
Same chapter3 marksDifficulty: Medium
What is the pH scale? State the pH of a neutral, an acidic and an alkaline solution.
Study of Acids, Bases and Salts
Same chapter2 marksDifficulty: Medium
What is meant by a basic salt? Give one example.
Study of Acids, Bases and Salts