State one observation for: </br>1. Excess NH4OH soln. is added to Pb(NO3)2 </br>2. NaOH soln. is added to FeCl3 soln. in excess.

Chalky white insoluble precipitate is obtained. Pb(NO3)2 + 2NH4OH ⟶ 2NH4NO3 + Pb(OH)2 ↓ Reddish brown insoluble precipitate is obtained. FeCl3 + 3NaOH ⟶ 3NaCl + Fe(OH)3 ↓

Question

State one observation for:
1. Excess NH4OH soln. is added to Pb(NO3)2
2. NaOH soln. is added to FeCl3 soln. in excess.

July 31, 2024

Answer

Chalky white insoluble precipitate is obtained.

Pb(NO₃)₂ + 2NH₄OH ⟶ 2NH₄NO₃ + Pb(OH)₂ ↓

Reddish brown insoluble precipitate is obtained.

FeCl₃ + 3NaOH ⟶ 3NaCl + Fe(OH)₃ ↓

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Action of Alkalis — on oxides and hydroxides of certain metals

Zinc oxide ZnO + NaOH ⟶ +

Zinc hydroxide Zn(OH)₂ + NaOH ⟶ +

Lead [II] oxide PbO + NaOH ⟶ +

Lead hydroxide Pb(OH)₂ + NaOH ⟶ +

Aluminium oxide Al₂O₃ + NaOH ⟶ +

Aluminium hydroxide Al(OH)₃ + KOH ⟶ +

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Action of Alkalis — on certain metals

Zinc Zn + NaOH ⟶ +

Zinc Zn + KOH ⟶ +

Lead Pb + NaOH ⟶ +

Lead Pb + KOH ⟶ +

Aluminium Al + NaOH + H₂O ⟶ +

Aluminium Al + KOH + H₂O ⟶ +

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Action of Ammonium Hydroxide – on solutions of salts

Magnesium chloride MgCl₂ + NH₄OH ⟶ + ↓

Iron [II] sulphate FeSO₄ + NH₄OH ⟶ + ↓

Iron [III] chloride FeCl₃ + NH₄OH ⟶ + ↓

Copper [II] sulphate CuSO₄ + NH₄OH ⟶ + ↓ [Cu(OH)₂ + (NH₄)₂SO₄ + NH₄OH [in excess] ⟶ + ]

Zinc sulphate ZnSO₄ + NH₄OH ⟶ + ↓ [Zn(OH)₂ +(NH₄)₂SO₄ + NH₄OH [in excess] ⟶ + ]

Lead nitrate Pb(NO₃)₂ + NH₄OH ⟶ + ↓

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Complete and balance the equations
Pb(NO3)2 + NaOH ⟶ …………… + …………… ↓
[Pb(OH)2 + NaOH [in excess] ⟶ …………… + ……………]

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Complete and balance the equations
ZnSO4 + NaOH ⟶ …………… + …………… ↓
[Zn(OH)2 + NaOH [in excess] ⟶ …………… + ……………]

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Oxides and hydroxides of certain metals i.e [iron/ zinc / copper / aluminium / magnesium / lead] are amphoteric and react with [acids / alkalis / acids and alkalis] to give salt and water.

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Zinc oxide	ZnO + NaOH ⟶ ____ + ____
Zinc hydroxide	Zn(OH)₂ + NaOH ⟶ ____ + ____
Lead [II] oxide	PbO + NaOH ⟶ ____ + ____
Lead hydroxide	Pb(OH)₂ + NaOH ⟶ ____ + ____
Aluminium oxide	Al₂O₃ + NaOH ⟶ ____ + ____
Aluminium hydroxide	Al(OH)₃ + KOH ⟶ ____ + ____

Question

State one observation for: 1. Excess NH4OH soln. is added to Pb(NO3)2 2. NaOH soln. is added to FeCl3 soln. in excess.

Answer

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Flash Education

State one observation for:
1. Excess NH4OH soln. is added to Pb(NO3)2
2. NaOH soln. is added to FeCl3 soln. in excess.