Which of the following is NOT considered a solution?

• A. Salt water
• B. Sugar dissolved in water
• C. Sand suspended in water
• D. Vinegar (acetic acid in water)

Answer: (C)

Verified step by step guidance

1. Understand the definition of a solution: A solution is a homogeneous mixture where one substance (the solute) is completely dissolved in another (the solvent), resulting in a single phase with uniform composition throughout.
2. Analyze each option to determine if it fits the definition of a solution:
3. Salt water: Salt (solute) is dissolved uniformly in water (solvent), forming a homogeneous mixture, so it is a solution.
4. Sugar dissolved in water: Sugar dissolves completely in water, creating a uniform mixture, so it is a solution.
5. Sand suspended in water: Sand particles do not dissolve but remain dispersed as solid particles, creating a heterogeneous mixture (a suspension), not a solution.
6. Vinegar (acetic acid in water): Acetic acid is completely dissolved in water, forming a homogeneous mixture, so it is a solution.