Chemistry
State your observations and write balanced equations.
(i) Sodium chloride solution is mixed with lead nitrate solution.
(ii) Ethylene gas is passed through a solution of bromine in carbon tetrachloride.
(iii) Sodium hydroxide is added to iron (III) sulphate solution.
(iv) Chlorine is passed through a solution of potassium iodide.
(v) Ammonium hydroxide solution is added to copper sulphate solution in excess.
Analytical Chemistry
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Answer
(i) When sodium chloride solution is mixed with lead nitrate solution, a white precipitate of lead chloride is seen and the soluble salt sodium nitrate is formed.
2NaCl + Pb(NO3)2 ⟶ 2Na(NO3)2 + PbCl2↓
(ii) Brown colour of bromine disappears when ethylene is bubbled through a solution of bromine in carbon tetrachloride.
C2H2 + Br2 ⟶ C2H2Br2 + Br2 ⟶ C2H2Br4
(iii) When sodium hydroxide is added to iron (III) sulphate, reddish brown ppt is formed, which is insoluble in excess of sodium hydroxide.
Fe2(SO4)3 + 6NaOH ⟶ 2Fe(OH)3 + 3Na2SO4
(iv) When chlorine gas is passed over aqueous potassium iodide, the colourless solution changes to yellow brown due to the formation of iodine.
Cl2 + 2KI ⟶ 2KCl + I2
(v) When ammonium hydroxide is reacted with a solution of copper sulphate, a pale blue ppt. of copper hydroxide is formed which dissolves in excess of ammonium hydroxide forming a soluble complex salt [Cu(NH3)4]SO4 [tetramine copper [II] sulphate] .
CuSO4 + 2NH4OH ⟶ (NH4)2SO4 + Cu(OH)2 ↓
Cu(OH)2 + (NH4)2SO4 + 2NH4OH ⟶ [Cu(NH3)4]SO4 + 4H2O
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Related Questions
You are provided with the following substances
A. Lead chloride
B. Zinc sulphide
C. Sodium carbonate
D. Lead Nitrate
E. Ammonium carbonate
F. Calcium chloride
G. Calcium sulphite
H. Zinc carbonate
I. Silver Nitrate
Choose one substance in each case which matches the description below :
(i) A normal salt formed when basic oxide and acidic oxide react
(ii) An insoluble binary salt
(iii) Insoluble carbonate
(iv) An insoluble salt formed from two soluble salts.
(v) A salt which on heating leaves metal as residue.
How will you identify the following salts: calcium chloride, lead chloride and zinc chloride?
Give balanced equations for the laboratory preparation of the following gases :
(i) Ammonia
(ii) Ethylene.
Give one difference between the following.
(i) Ionisation and electrolytic dissociation.
(ii) Ionisation potential and electron affinity.
(iii) Polar and non-polar molecule.
(iv) Normal salt and acidic salt.
(v) Saturated hydrocarbons and unsaturated hydrocarbons.