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ICSE Class 10 Chemistry Question 3 of 6

Analytical Chemistry — Use of Ammonium & Sodium Hydroxide — Question 1

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Question 1

Action of Sodium Hydroxide — on solutions of saltsComplete and balance the equations
1a. Calcium nitrate andCa(NO3)2 + NaOH ⟶ ............... + ............... ↓
1b. Magnesium ChlorideMgCl2 + NaOH ⟶ ............... + ............... ↓
2. Iron [II] sulphateFeSO4 + NaOH ⟶ ............... + ............... ↓
3. Iron [III] chlorideFeCl3 + NaOH ⟶ ............... + ............... ↓
4. Copper [II] sulphateCuSO4 + NaOH ⟶ ............... + ............... ↓
5. Zinc sulphateZnSO4 + NaOH ⟶ ............... + ............... ↓

[Zn(OH)2 + NaOH [in excess] ⟶ ............... + ...............]
6. Lead nitratePb(NO3)2 + NaOH ⟶ ............... + ............... ↓

[Pb(OH)2 + NaOH [in excess] ⟶ ............... + ...............]
Answer
Action of Sodium Hydroxide — on solutions of saltsComplete and balance the equations
1a. Calcium nitrate andCa(NO3)2 + 2NaOH ⟶ 2NaNO3 + Ca(OH)2 ↓
1b. Magnesium ChlorideMgCl2 +2NaOH ⟶ 2NaCl + Mg(OH)2 ↓
2. Iron [II] sulphateFeSO4 + 2NaOH ⟶ Na2SO4 + Fe(OH)2 ↓
3. Iron [III] chlorideFeCl3 + 3NaOH ⟶ 3NaCl + Fe(OH)3 ↓
4. Copper [II] sulphateCuSO4 + 2NaOH ⟶ Na2SO4 + Cu(OH)2 ↓
5. Zinc sulphateZnSO4 + 2NaOH ⟶ Na2SO4 + Zn(OH)2 ↓

[Zn(OH)2 + 2NaOH [in excess] ⟶ 2H2O + Na2ZnO2]
6. Lead nitratePb(NO3)2 + 2NaOH ⟶ 2NaNO3 + Pb(OH)2 ↓

[Pb(OH)2 + 2NaOH [excess] ⟶ 2H2O + Na2PbO2]