To perform the reaction between sodium sulphate and barium chloride solutions and classify it - Lab Work

To perform the reaction between sodium sulphate and barium chloride solutions and classify it on Combination reaction, Decomposition reaction, Displacement reaction and Double displacement reaction

Aim
 To perform the reaction between sodium sulphate and barium chloride solutions and classify it on:
i. Combination reaction
ii. Decomposition reaction
iii. Displacement reaction
iv. Double displacement reaction

Theory
(a) Barium chloride and Sodium sulphate reacts in an aqueous solution to give precipitate of barium sulphate.
Reaction:   BaCl2(aq) + Na2SO4(s) → BaSO4(s) + NaCl(aq)
(c) Since, there is displacement in both the reactants, it is a case of double displacement reaction.

Chemicals Required
Sodium sulphate solution, Barium chloride solution, Dilute HCl

Apparatus Required
Beaker, Test tubes, Glass rod

Procedure
Step 1: Two test tubes are washed and cleaned.
Step 2: About 5 ml of an aqueous solution of barium chloride in one test tube is taken. An equal volume of sodium sulphate solution is taken in another test tube.
Step 3: A 50 ml beaker is taken.
Step 4: Barium chloride solution is added to the sodium sulphate solution in the beaker.
Step 5: The colour of the precipitate so formed is noted.

Observation
When the solutions of sodium sulphate and barium chloride are mixed a white precipitate is formed which is insoluble in HCl.

Inference
1. When sodium sulphate chemically reacts with barium chloride in the form of their aqueous solutions, white precipitate of barium sulphate appears. This confirms the presence of sulphate (SO4)2- ions.
Reaction: BaCl2(aq) + Na2SO4(s) → BaSO4(s) + NaCl(aq)

Precautions
1. Handle the acids and alkali carefully.
2. Use equal volumes of barium chloride and sodium silphate solutions.
3. Clean the apparatus thoroughly before using it.

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