Consider the reaction represented by the following equation CaCI2 (aq) + H 2C2O 4(aq) ⇌ CaC 2O4(s) + 2HCI(aq). Which of the following would dissolve the pre...

Answer Details

The formation of a precipitate in this reaction indicates that CaC ₂O₄ is insoluble in water. In order to dissolve the precipitate, we need to find a substance that can react with it to form a soluble compound. , adding concentrated hydrochloric acid, is the correct answer. This is because the reaction between CaC ₂O₄ and HCl produces soluble calcium chloride (CaCl ₂) and carbon dioxide (CO ₂). The balanced chemical equation for this reaction is: CaC ₂O₄ + 4HCl → CaCl ₂ + 2CO ₂ + 2H ₂O The carbon dioxide gas will escape as bubbles, leaving behind a solution of CaCl ₂, which is soluble in water. The other options will not dissolve the CaC ₂O₄ precipitate. Stirring the mixture vigorously will not change the chemical nature of the substances in the solution. Adding more calcium chloride solution will not react with the CaC ₂O₄ precipitate since it is already present in excess. Increasing the concentration of ethanedioic acid will not react with CaC ₂O₄ either, as it is a weak acid and cannot displace the strong acid HCl. Adding distilled water will not dissolve the precipitate since CaC ₂O₄ is insoluble in water.