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MODULE • Chemistry Form 4

(ii) Write a balanced chemical equation for the reaction that occur.
Tuliskan persamaan kimia yang seimbang bagi tindak balas yang berlaku.
PbCO 3 + HNO 3 Pb(NO 3 ) 2 + H 2 O + CO 2
(c) (i) Describe how to prepare pure and dry lead(II) sulphate in reaction II.
Huraikan bagaimana cara menyediakan plumbum(II) sulfat yang tulen dan kering dalam tindak balas II.
– 50 cm 3 of 1 mol dm lead(II) nitrate solution is added to 50 cm 3 of 1 mol dm
–3
–3
sodium sulphate solution in a beaker.
50 cm 3 larutan plumbum(II) nitrat 1 mol dm ditambahkan kepada 50 cm 3 larutan natrium sulfat
–3
1 mol dm ke dalam bikar.
–3
– The mixture is stirred with glass rod.
Campuran tersebut dikacau dengan rod kaca.
– The mixture is filtered. The white precipitate of lead(II) sulphate is collected as the residue.
Campuran dituraskan. Mendakan putih plumbum(II) sulfat dikumpulkan sebagai baki.
– The precipitate is rinsed with distilled water .
Mendakan tersebut dibilas dengan air suling .
– The precipitate is pressed between sheets of filter papers to dry it.
Mendakan tersebut ditekan antara kertas turas .
(ii) Write an ionic equation the reaction that occur.
Tuliskan persamaan ion bagi tindak balas yang berlaku.
2–
2+
Pb + SO PbSO 4
4
(iii) Name the type of reaction that occur in reaction II.
Namakan jenis tindak balas yang berlaku dalam tindak balas II.
Double decomposition reaction

(iv) What is the step taken to make sure that pure lead(II) sulphate in reaction II is pure?
Apakah langkah yang diambil untuk memastikan plumbum(II) sulfat dalam tindak balas II tulen?

The precipitate is rinsed with distilled water.
(d) (i) Can lead(II) sulphate be prepared by adding excess of lead(II) nitrate to calcium(II) sulphate followed by
filtration. Explain your answer.
Bolehkah plumbum(II) sulfat disediakan dengan menambahkan plumbum(II) nitrat berlebihan kepada kalsium(II) sulfat dan
diikuti dengan penurasan? Terangkan jawapan anda.
– Cannot.
– Calcium sulphate is insoluble salt, it cannot form a solution and there are no free moving ions.

– Double decomposition reaction cannot occur.
(ii) Can lead(II) sulphate be prepared by adding excess of lead(II) oxide to sulphuric acid. Explain your answer.
Bolehkah plumbum(II) sulfat disediakan dengan menambahkan plumbum(II) oksida berlebihan kepada asid sulfurik? Terangkan
jawapan anda.
– Cannot.

– Lead(II) sulphate and lead(II) oxide are insoluble, both cannot be separated by filtration.
– The insoluble lead(II) sulphate will prevent lead(II) oxide to undergo further reaction with sulphuric acid.

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