Chemistry
The diagram represents the preparation of sodium sulphate salt from dil. H2SO4 acid and sodium hydroxide.
- Name the apparatus 'A'.
- Name the substance 'X' placed in 'A' and the substance 'Y' placed in B.
- State the reason for conducting the titration using the apparatus 'A' and 'B'.
- State which solution is transferred to the evaporating dish and evaporated to point of crystallization for obtaining the salt.
- State why titration is not conducted for the preparation of copper [II] sulphate crystals by neutralization.
Answer
- Burette
- Dil. sulphuric acid (H2SO4) is substance 'X' placed in 'A' and sodium hydroxide (NaOH) is the substance 'Y' placed in B.
- Titration is conducted to determine the completion of the neutralization reaction, i.e. to determine the amount of sulphuric acid required to neutralize a known amount of sodium hydroxide.
- Aqueous sodium sulphate (Na2SO4.10H2O) is transferred to the evaporating dish and evaporated to point of crystallisation for obtaining the salt.
- As copper (II) oxide is not soluble in water hence titration is not conducted for the preparation of copper (II) sulphate crystals by neutralization.
Related Questions
Give reasons for the following:
Concentrated sulphuric acid is a weaker acid compared to dilute sulphuric acid.
State which of the following methods is generally used for preparing the salts 1 to 5 given below:
A: Neutralisation — insoluble base and dil. acid
B: Neutralisation — alkali and dil. acid
C: Simple displacement — active metal and dil. acid
D: Direct combination
E: Precipitation [double decomposition]
- PbCO3
- Zn(NO3)2
- NaCl
- Cu(NO3)2
- FeS
Give balanced equations for the preparation of the following salts:
- Calcium oxide ⟶ Calcium chloride ⟶ Calcium carbonate
- Zinc sulphide ⟵ Zn ⟶ Zinc sulphate
- Iron [II] chloride ⟵ Fe ⟶ Iron [III] chloride
- Lead [II] oxide ⟶ Lead nitrate ⟶ Lead sulphate
- Copper [II] oxide ⟶ Copper [II] sulphate ⟵ Copper [II] hydroxide
Give reasons for the following:
An aqueous solution of the salt ammonium chloride is acidic in nature while an aqueous solution of sodium chloride is neutral.