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Chemistry

State your observations when:

(i) Barium chloride soln. is mixed with sodium sulphate soln.

(ii) Concentrated sulphuric acid is added to sugar crystals.

Sulphuric Acid

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Answer

(i) White coloured precipitate of barium sulphate is formed when sodium sulphate is mixed with barium chloride.

Na2SO4 (dil.) + BaCl2 (aq.) ⟶ 2NaCl + BaSO4 ↓ [white ppt. formed]

(ii) Black spongy charred mass of carbon is formed. Steam is seen to be evolved.

C12H22O11Conc. H2SO412C [sugar charcoal]+11H2O\text{C}{12}\text{H}{22}\text{O}{11}\xrightarrow{\text{Conc. H}2\text{SO}4} \text{12C} \small{\space[sugar\space charcoal]} + \text{11H}2\text{O}

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