What are the variables, hypothesis, and purpose for both parts of Osmosis and Diffusion AP Lab?
I have no idea what you did.
Did you vary salinity (concentration)? Did you vary time? Did you vary membranes? Did you vary pressure?
To determine the variables, hypothesis, and purpose for both parts of the Osmosis and Diffusion AP Lab, let's break down each part individually.
Part 1: Osmosis
Variables:
- Independent Variable: Concentration of the solute solution (e.g., sucrose solution)
- Dependent Variable: Rate of osmosis (e.g., change in mass or size of the potato strips)
- Controlled Variables: Temperature, size and shape of potato strips, time of immersion, and volume of the solute solution
Hypothesis:
If the concentration of the solute solution is higher than the concentration inside the potato cells, then the potato strips will lose mass due to water moving out of the cells by osmosis. Conversely, if the concentration of the solute solution is lower, the potato strips will gain mass as water moves into the cells.
Purpose:
The purpose of this part of the lab is to investigate the process of osmosis, which is the diffusion of water molecules across a selectively permeable membrane. By observing the change in mass of the potato strips in different solute concentrations, the rate of osmosis can be determined.
Part 2: Diffusion
Variables:
- Independent Variable: Temperature
- Dependent Variable: Rate of diffusion (e.g., time taken for a substance to diffuse a fixed distance)
- Controlled Variables: Concentration of the diffusing substance, volume of the diffusing substance, size and shape of the container used
Hypothesis:
If the temperature increases, then the rate of diffusion will also increase, as higher temperatures generally lead to increased molecular movement and kinetic energy.
Purpose:
The purpose of this part of the lab is to investigate the effect of temperature on the rate of diffusion. By measuring the time taken for a substance to diffuse a fixed distance at different temperatures, the relationship between temperature and diffusion can be determined.
Remember, these explanations are generalized, and your lab instructions may have specific variations. Always refer to your lab manual or guidelines for accurate information during your experiment.