Chemistry
What do you observe when dilute sulphuric acid is added to the following:
(a) Sodium Sulphide
(b) Sodium Carbonate
(c) Zinc granules
Practical Chemistry
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Answer
(a) When dil. sulphuric acid is added to sodium sulphide and heated, hydrogen sulphide gas is evolved which has the smell of rotten eggs and turns lead acetate paper black.
Na2S + H2SO4 ⟶ Na2SO4 + H2S
(b) When dilute sulphuric acid is added to sodium carbonate a colourless gas [CO2] is evolved with brisk effervescence that turns lime water milky and has no effect on acidified potassium dichromate paper.
Na2CO3 + H2SO4 ⟶ Na2SO4 + H2O + CO2 (g)
(c) When dilute sulphuric acid is added to granulated zinc, hydrogen gas is evolved with an effervescence.
Zn + H2SO4 (dil) ⟶ ZnSO4 + H2 (g)
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