Same chapter3 marksDifficulty: Medium
What is meant by water of crystallisation? Give two examples of hydrated salts with their formulae.
Study of Acids, Bases and Salts
3 marksDifficulty: Medium
A student wishes to prepare lead sulphate, which is insoluble. Describe the method and write the equation.
Original Khojo Papers practice question — not from a past board paper.
Answer
Two soluble salts are mixed so that the insoluble salt is precipitated: Pb(NO3)2 + Na2SO4 → PbSO4↓ + 2NaNO3. The precipitate is filtered, washed and dried.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
A direct reaction of lead with dilute sulphuric acid would not work, because the insoluble sulphate coats the metal and stops the reaction.
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