Gravimetric Analysis: Understanding Ba2+ Solutions

How can a solution of 2.5 M Ba2+ be prepared?

a) Dissolving 583 grams of barium sulfate in one liter of water

b) Mixing barium nitrate with water

c) Heating barium chloride with hydrochloric acid

Answer:

The correct answer is: a) Dissolving 583 grams of barium sulfate in one liter of water.

In order to prepare a solution of 2.5 M Ba2+, you would need to dissolve 583 grams of barium sulfate in one liter of water. This process results in the formation of barium ions (Ba2+) in the solution. It is important to note that simply mixing barium nitrate with water or heating barium chloride with hydrochloric acid will not produce a solution of 2.5 M Ba2+.

Gravimetric analysis is a powerful technique used in analytical chemistry to determine the amount of a substance by precipitation and weighing. In the case of Ba2+ solutions, it involves the formation of a solid precipitate of barium sulfate (BaSO4) by reacting barium ions with sulfate ions. The mass of the precipitate can then be used to calculate the concentration of barium ions in the solution.

By following the correct procedure of dissolving barium sulfate in water, you can accurately prepare a solution of 2.5 M Ba2+ for various analytical applications. It is crucial to understand the principles of gravimetric analysis to ensure accurate and reliable results in chemical analysis.