Q.1. Are all concentrated acids and alkalis corrosive?
Q.2. How to determine a metal hydroxide and metal oxide / metal carbonate and metal hydrogencarbonate whether it would react with both acid and alkai to give a salt and water / salt, carbon dioxide and water?
Q.3. What is the reaction between excess calcium chloride solution and ammonium sulphate solution?
Thz~
CE Chemistry VII
2008-04-13 1:02 am
回答 (1)
2008-04-13 1:57 am
✔ 最佳答案
Q.1Each concentrated acid or concentrated alkali is corrosive to a certain extent.
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Q.2
All metal carbonates and metal hydrogencarbonates can react with acids to form salt, water and carbon dioxide. However, they cannot react with alkali.
All metal hydroxides can react with strong acid solutions to form salts and water.
e.g. Zn(OH)2(s) + 2H+(aq) → Zn2+(aq) + 2H2O(l)
Only amphoteric (兩性的) hydroxides (e.g. Zn(OH)2, Al(OH)3, Pb(OH)2, etc.) can react with strong alkali solutions to form salts.
e.g. Zn(OH)2(s) + 2OH-(aq) → [Zn(OH)4]2-(aq)
All metal oxides can react with strong acid solutions to form salts and water.
e.g. Al2O3(s) + 6H+(aq) → 2Al3+(aq) + 3H2O(l)
Only amphoteric (兩性的) oxides (e.g. ZnO, Al2O3, PbO, etc.) can react with strong alkali solutions to form salts.
e.g. Al2O3(s) + 3H2O(l) + 2OH-(aq) → 2[Al(OH)4]-(aq)
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Q.3
All white precipitate of calcium sulphate is formed.
Ca2+(aq) + SO42-(aq) → CaSO4(s)
or CaCl2(aq) + (NH4)2SO4(aq) → CaSO4(s) + 2NH4Cl(aq)
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