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Difficulty: MediumTypes and Preparation Methods of Salts

Match each salt listed in Column A with its appropriate laboratory preparation method from Column B.

  • Lead(II) sulfate (PbSO4PbSO_4)Precipitation (Double Decomposition)
  • Sodium nitrate (NaNO3NaNO_3)Titration of an acid with a soluble alkali
  • Copper(II) sulfate (CuSO4CuSO_4)Action of dilute acid on an insoluble base
  • Iron(III) chloride (FeCl3FeCl_3, anhydrous)Direct combination of constituent elements

Answer

Lead(II) sulfate pairs with Precipitation (Double Decomposition); Sodium nitrate pairs with Titration of an acid with a soluble alkali; Copper(II) sulfate pairs with Action of dilute acid on an insoluble base; Anhydrous iron(III) chloride pairs with Direct combination of constituent elements.
Matching each salt to its preparation method requires analyzing solubility and chemical properties: insoluble salts like lead(II) sulfate are formed by precipitation/double decomposition; soluble sodium salts require neutralization by titration; soluble copper salts are synthesized using an insoluble oxide; and volatile anhydrous halides like iron(III) chloride are synthesized by direct combination of elements.

Step-by-Step Solution

1
Classify the salts by solubility in water.
Lead(II) sulfate is insoluble, while sodium nitrate, copper(II) sulfate, and iron(III) chloride are soluble.
The method of salt preparation depends primarily on whether the target salt is soluble or insoluble.
2
Determine the preparation method for the insoluble salt.
Lead(II) sulfate is prepared by precipitation (double decomposition) combining soluble aqueous reactants such as lead(II) nitrate and sodium sulfate.
Precipitation is the standard method for preparing insoluble salts.
3
Determine preparation methods for the soluble salts based on reactant nature.
Sodium nitrate requires titration because both sodium hydroxide and sodium nitrate are soluble; Copper(II) sulfate uses an insoluble base (copper(II) oxide) reacted with dilute acid; Anhydrous iron(III) chloride requires direct combination to avoid hydrolysis by water.
Group 1/ammonium soluble salts require titration, while anhydrous iron(III) chloride cannot be prepared by evaporation from aqueous solution due to hydration and hydrolysis.

Key Concept

Laboratory Preparation Methods of Soluble and Insoluble Salts
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Topics

Types and Preparation Methods of Salts

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