Chemistry
| Action of Alkalis — on certain metals | |
|---|---|
| 13. Zinc | Zn + NaOH ⟶ …………… + …………… |
| 14. Zinc | Zn + KOH ⟶ …………… + …………… |
| 15. Lead | Pb + NaOH ⟶ …………… + …………… |
| 16. Lead | Pb + KOH ⟶ …………… + …………… |
| 17. Aluminium | Al + NaOH + H2O ⟶ …………… + …………… |
| 18. Aluminium | Al + KOH + H2O ⟶ …………… + …………… |
Alkalis
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Answer
| Action of Alkalis — on certain metals | |
|---|---|
| 13. Zinc | Zn + 2NaOH ⟶ Na2ZnO2 + H2 |
| 14. Zinc | Zn + 2KOH ⟶ K2ZnO2 + H2 |
| 15. Lead | Pb + 2NaOH ⟶ Na2PbO2 + H2 |
| 16. Lead | Pb + 2KOH ⟶ K2PbO2 + H2 |
| 17. Aluminium | 2Al + 2NaOH + 2H2O ⟶ 2NaAlO2 + 3H2 |
| 18. Aluminium | 2Al + 2KOH + 2H2O ⟶ 2KAlO2 + 3H2 |
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Related Questions
Action of Sodium Hydroxide — on solutions of salts Complete and balance the equations 1a. Calcium nitrate and Ca(NO3)2 + NaOH ⟶ …………… + …………… ↓ 1b. Magnesium Chloride MgCl2 + NaOH ⟶ …………… + …………… ↓ 2. Iron [II] sulphate FeSO4 + NaOH ⟶ …………… + …………… ↓ 3. Iron [III] chloride FeCl3 + NaOH ⟶ …………… + …………… ↓ 4. Copper [II] sulphate CuSO4 + NaOH ⟶ …………… + …………… ↓ 5. Zinc sulphate ZnSO4 + NaOH ⟶ …………… + …………… ↓
[Zn(OH)2 + NaOH [in excess] ⟶ …………… + ……………]6. Lead nitrate Pb(NO3)2 + NaOH ⟶ …………… + …………… ↓
[Pb(OH)2 + NaOH [in excess] ⟶ …………… + ……………]Action of Ammonium Hydroxide — on solutions of salts 7. Magnesium chloride MgCl2 + NH4OH ⟶ …………… + …………… ↓ 8. Iron [II] sulphate FeSO4 + NH4OH ⟶ …………… + …………… ↓ 9. Iron [III] chloride FeCl3 + NH4OH ⟶ …………… + …………… ↓ 10. Copper [II] sulphate CuSO4 + NH4OH ⟶ …………… + …………… ↓
[Cu(OH)2 + (NH4)2SO4 + NH4OH [in excess] ⟶ …………… + …………… ]11. Zinc sulphate ZnSO4 + NH4OH ⟶ …………… + …………… ↓
[Zn(OH)2 +(NH4)2SO4 + NH4OH [in excess] ⟶ …………… + ……………]12. Lead nitrate Pb(NO3)2 + NH4OH ⟶ …………… + …………… ↓ Action of Alkalis — on oxides and hydroxides of certain metals 19. Zinc oxide ZnO + NaOH ⟶ …………… + …………… 20. Zinc hydroxide Zn(OH)2 + NaOH ⟶ …………… + …………… 21. Lead [II] oxide PbO + NaOH ⟶ …………… + …………… 22. Lead hydroxide Pb(OH)2 + NaOH ⟶ …………… + …………… 23. Aluminium oxide Al2O3 + NaOH ⟶ …………… + …………… 24. Aluminium hydroxide Al(OH)3 + KOH ⟶ …………… + …………… Sodium hydroxide solution is added first in a small amount, then in excess to the aqueous salt solutions of:
- copper [II] sulphate
- zinc nitrate
- lead nitrate
- iron [III] sulphate
State in each case :
(i) the colour of the precipitate when NaOH is added in a small quantity;
(ii) the nature of the precipitate [i.e. soluble or insoluble] when NaOH is added in excess.