PSI Barbering Practice Exam

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What do non-aqueous solutions, like alcohol or oil, lack that aqueous solutions have?

Hydrogen ions
Water
Acidity
Solubility

The correct answer is: Water

The correct answer is that non-aqueous solutions, such as alcohol or oil, lack water, which is the defining characteristic of aqueous solutions. Aqueous solutions are specifically characterized by the presence of water as the solvent, which plays a crucial role in the dissolving process and the overall properties of the solution. In contrast, non-aqueous solutions utilize solvents other than water, fundamentally changing their chemical and physical properties. This difference can affect solubility, reactivity, and even the types of chemical interactions that can occur. For example, while water can dissolve many polar substances due to its hydrogen bonding capabilities, non-aqueous solvents may dissolve non-polar substances better. Therefore, the defining difference is the absence of water in non-aqueous solutions, making this the correct choice.