An ion can be removed from an aqueous solu-
tion by
1. the formation of a gas that escapes.
2. formation of a precipitate.
3. the formation of what is essentially a
nonelectrolyte.
4. All of these
4. All of these
4 All of these
big hint: Reactions go to completion for one of three reasons.
a. a gas is formed.
b. a precipitate is formed.
c. a slightly ionized substance is formed.
To determine the correct answer, we can examine each option and analyze whether it is a possible way to remove an ion from an aqueous solution.
1. The formation of a gas that escapes is indeed a method to remove an ion from an aqueous solution. If a chemical reaction occurs in the solution that produces a gaseous product, this gas will escape and remove the ion from the solution.
2. Formation of a precipitate is also a method to remove an ion from an aqueous solution. When two aqueous solutions containing ions are mixed, a reaction may occur that produces an insoluble compound called a precipitate. This precipitate will then settle at the bottom and can be separated, effectively removing the ions from the solution.
3. The formation of what is essentially a nonelectrolyte can also remove an ion from an aqueous solution. Nonelectrolytes do not dissociate into ions when dissolved in water. If an ion reacts with a substance that forms a nonelectrolyte, the ion will no longer be present in an ionic form and will be effectively removed from the solution.
4. Based on the explanations above, the correct answer is indeed option 4: "All of these." All three options (formation of a gas, precipitation, and formation of a nonelectrolyte) can be used to remove an ion from an aqueous solution.
If you encounter specific ions or compounds, it is important to consult relevant solubility rules or chemical reactions to determine if and how they can be removed from a solution.