The true statement regarding water as a substance is:
(Choice B) A water solution is also known as an aqueous solution.
Here's a brief explanation of the other choices:
- (Choice A) Ionic substances are generally soluble in water, especially if they are soluble salts.
- (Choice C) Water is a polar solvent, not non-polar.
- (Choice D) Not all solutes dissolve easily in water; for example, many oils and certain non-polar substances do not dissolve in water.
Therefore, the correct answer is (Choice B).