Question

If an aqueous solution of ____ is added to a mixture of cl â and so42â

Answer 1

The question involves predicting the reactions that occur when specific compounds mix in an aqueous solution. The reactants mentioned may form precipitates, depending on their solubility. For example, mixing aqueous solutions of barium chloride and lithium sulfate results in the precipitation of insoluble barium sulfate.

Step-by-step explanation:

The student's question involves determining the reactions that occur when various compounds are mixed in an aqueous solution. Here are the detailed reactions for the provided scenarios:

• An aqueous solution of strontium hydroxide reacts with an aqueous solution of iron(II) chloride, potentially forming a precipitate of iron(II) hydroxide if the solution's pH conditions are right.
• Solid potassium phosphate reacts with an aqueous solution of mercury(II) perchlorate, potentially creating a mercury(II) phosphate precipitate, if it is insoluble under the conditions.
• Solid sodium fluoride added to an aqueous solution of ammonium formate could potentially alter the pH, but a precipitate is unlikely.
• When aqueous solutions of calcium bromide and cesium carbonate are mixed, a precipitate of calcium carbonate could form due to its low solubility.

For a specific example: When aqueous solutions of barium chloride and lithium sulfate are mixed, barium sulfate (BaSO4), which is insoluble in water, precipitates out. The net ionic equation for this reaction is:

Ba2+(aq) + SO42-(aq) → BaSO4(s)

Answer 2

If an aqueous solution of Ba(NO3)2 is added to a mixture of chloride and sulfate, the sulfate ion will precipitate as BaSO4 because it is insoluble in water but the chloride ion will remain in the solution.

Step-by-step explanation:

Ba(NO₃)₂ reacts with a chloride salt XCl to form BaCl₂ which is soluble in water while BaSO₄ precipitate since sulphate salt of barium is insoluble in water. This is an elemental test for anions to determine which element is present in an unknown solution. This is used to differentiate between if a sulphate or chloride is present in a given compound.