Which of the following products are formed when sodium sulphate reacts with barium chloride?

Question

Examoogle · Accepted Answer

The correct answer is Option A: White precipitate of $BaSO_{4}$ and $2NaCl$ (aq). When aqueous solutions of sodium sulphate ($Na_2SO_4$) and barium chloride ($BaCl_2$) are mixed, a double displacement reaction takes place. This results in the formation of a white precipitate of barium sulphate ($BaSaO_4$) and an aqueous solution of sodium chloride ($NaCl$).

Step-by-Step Solution & Concepts:
When aqueous solutions of sodium sulphate ($Na_2SO_4$) and barium chloride ($BaCl_2$) are mixed, a double displacement reaction takes place. This results in the formation of a white precipitate of barium sulphate ($BaSaO_4$) and an aqueous solution of sodium chloride ($NaCl$).

Working Principle: In this double displacement reaction (also known as a precipitation reaction), the barium ions ($Ba^{2+}$) from barium chloride react with the sulphate ions ($SO_4^{2-}$) from sodium sulphate to instantly precipitate as insoluble barium sulphate ($BaSO_4$). Simultaneously, sodium ions ($Na^+$) and chloride ions ($Cl^-$) remain in solution as soluble sodium chloride ($NaCl$).

Key Formulas: $Na_2SO_4(aq) + BaCl_2(aq) \rightarrow BaSO_4(s) + 2NaCl(aq)$ — Balanced chemical equation for the double displacement reaction

Key Points: Barium sulphate ($BaSO_4$) is an insoluble white solid that separates out as a precipitate.; Sodium chloride ($NaCl$) remains dissolved in the aqueous medium.; This is a classic example of a double displacement and precipitation reaction.

Advantages: Used to test for the presence of sulphate ions in analytical chemistry.

Applications: Detection of sulphate radicals in qualitative salt analysis.; Manufacturing of barium compounds.

Additional Info: Precipitation reactions produce insoluble ionic solids upon mixing two salt solutions.. Option A is correct because $BaSO_4$ forms a characteristic white precipitate.

Answer: A is correct — White precipitate of BaSO4 and 2NaCl (aq)

Exam Tip: Always remember that barium sulphate ($BaSO_4$) is a heavy, white-colored precipitate insoluble in water and dilute acids, frequently asked in chemistry practical viva questions.

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