Question

multiple choice question
which of the following affect(s) the osmotic pressure of a solution?

the size of the container containing the solution
the temperature of the solution
the color of the solution
the number (concentration) of solute particles it contains

Explanation:

1. Recall the formula for osmotic pressure: $\Pi = iMRT$, where $\Pi$ is osmotic pressure, $i$ is the van't Hoff factor, $M$ is molarity (related to solute particle concentration), $R$ is the gas constant, and $T$ is temperature (in Kelvin).
2. Analyze each option:

• The size of the container: Osmotic pressure depends on solute concentration, temperature, etc., not container size. So this does not affect osmotic pressure.
• The temperature of the solution: From the formula $\Pi = iMRT$, temperature ($T$) is a direct factor. Higher temperature increases osmotic pressure (assuming other factors constant).
• The color of the solution: Color is a physical property related to light absorption/scattering, not related to osmotic pressure (which is a colligative property based on solute particles and temperature).
• The number (concentration) of solute particles: Molarity ($M$) in the osmotic pressure formula is related to solute particle concentration. More solute particles (higher concentration) increase osmotic pressure (colligative property).

Answer:

B. The temperature of the solution, D. The number (concentration) of solute particles it contains