Final answer:
The correct option is A.
The correct statement regarding water as a substance is that a water solution is also known as an aqueous solution because water can contain one or more dissolved substances and is considered a polar solvent capable of dissolving many ionic and polar substances.
Step-by-step explanation:
The true statement regarding water as a substance is Choice A: A water solution is also known as an aqueous solution. This is because an aqueous solution is basically water that contains one or more dissolved substances, which can be solids, gases, or other liquids.
Water is a polar solvent, which makes it exceptionally good at dissolving many different substances, particularly ionic and polar substances due to the ion-dipole attractions between the water molecules and the ions in these compounds. Although most ionic compounds are soluble in water, being a polar solvent, water does not dissolve all solutes equally, and there are many ionic substances that have limited solubility in water.
Therefore, Choices B, C, and D are incorrect because: B - Many ionic substances are indeed soluble in water; C - Not all solutes dissolve in water easily, as solubility varies; and D - Water is not a non-polar solvent, but rather a highly polar one.