Which of the following statements correctly describes a solution?
a. In a solution the solute is chemically dissolved by the solvent.
b. Solutions involve large particles suspended in another component.
c. The particles in a solution will settle out if left to sit.
d. The amount of solute in a solution is expressed as the solution's concentration.

Verified step by step guidance

1. Step 1: Understand the definition of a solution. A solution is a homogeneous mixture where one substance (the solute) is dissolved in another substance (the solvent). The solute is evenly distributed at the molecular level within the solvent.
2. Step 2: Analyze option a. This statement says that the solute is chemically dissolved by the solvent. This is correct because in a solution, the solute dissolves in the solvent to form a uniform mixture.
3. Step 3: Analyze option b. This statement mentions large particles suspended in another component. This is incorrect because solutions involve particles that are molecular or ionic in size, not large particles. Large particles are characteristic of suspensions, not solutions.
4. Step 4: Analyze option c. This statement claims that particles in a solution will settle out if left to sit. This is incorrect because in a true solution, the solute particles do not settle out over time; they remain evenly distributed.
5. Step 5: Analyze option d. This statement says the amount of solute in a solution is expressed as the solution's concentration. This is correct because concentration is a measure of how much solute is present in a given amount of solvent or solution.

Key Concepts

Solution Definition

A solution is a homogeneous mixture where one substance, the solute, is completely dissolved in another, the solvent. This means that the solute's particles are distributed evenly at the molecular level, resulting in a clear and uniform appearance. For example, when salt is dissolved in water, it forms a solution where the salt ions are dispersed throughout the water.

Concentration

Concentration refers to the amount of solute present in a given volume of solution. It is a crucial concept in chemistry as it quantifies how much solute is dissolved in the solvent, often expressed in units such as molarity (moles per liter) or percentage. Understanding concentration helps in predicting the behavior of solutions in various chemical reactions.

Suspension vs. Solution

A suspension is a heterogeneous mixture where large particles are dispersed in a liquid but not dissolved, causing them to settle over time. In contrast, a solution is stable and does not allow particles to settle out, as the solute is fully dissolved. This distinction is important for understanding the properties and behaviors of different types of mixtures in chemistry.