An ion can be removed from an aqueous solution by
1. formation of a precipitate.
2. the formation of a gas that escapes.
3. All of these
4. the formation of what is essentially a
nonelectrolyte.
All of these.
To determine the correct answer, let's go through each option and discuss how an ion can be removed from an aqueous solution:
1. Formation of a precipitate: When two or more ions in a solution combine to form an insoluble compound, it results in the formation of a solid called a precipitate. This precipitate can then be separated from the solution through processes like filtration or centrifugation.
2. Formation of a gas that escapes: Some reactions can lead to the formation of gases. If the ion in question forms a gas during a chemical reaction, it can escape from the solution into the surrounding air. As a result, the ion is effectively removed from the aqueous solution.
3. All of these: This option suggests that both formation of a precipitate and the formation of a gas can remove ions from an aqueous solution. Therefore, if any of these methods are applicable to a specific ion, it can be removed using either or both of these processes.
4. The formation of what is essentially a nonelectrolyte: An electrolyte is a substance that can conduct electricity when dissolved in water due to the presence of ions. On the other hand, a nonelectrolyte does not dissociate into ions in water and cannot conduct electricity. If the ion in question undergoes a reaction that converts it into a compound that does not ionize or dissociate when dissolved, it essentially becomes a nonelectrolyte, and thus, effectively removed from the aqueous solution.
Considering the explanations above, the correct answer would be option 3: All of these. Both the formation of a precipitate and the formation of a gas can remove an ion from an aqueous solution.