Determining Molarity in Osmosis Experiments

Mr. Po explains a lab experiment to determine the molarity of potato cells using different glucose solutions. The procedure involves preparing potato cores, measuring their initial mass, immersing them in solutions, and measuring the final mass after 24 hours. The percent change in mass is calculated to determine the molarity of the potato cells. The video also discusses osmosis concepts and provides guidance on interpreting results. Additional resources on related topics are mentioned for further learning.

What does a higher molarity in the solution indicate about its sweetness if compared to lemonade?

• Less sweet

• Bitter taste

• Sweeter

• No sweetness

What is the purpose of using different molarity solutions in this experiment?

• To observe color changes in different solutions

• To see the effect of temperature on potato

• To determine the molarity of potato cells

• To test the solubility of potato

Why is it crucial to measure the initial mass of the potato cores before the experiment?

• To calculate the final volume

• To observe color changes

• To determine percentage mass change

• To check the potato quality

Why is distilled water used in one of the experimental setups?

• To increase the solute concentration

• To test the purity of the water

• To decrease the experiment's duration

• To provide a control with no solutes

What should be done to the potato cores after removing them from the solutions?

• They should be frozen

• They should be immediately weighed

• They should be heated

• They should be dried off

How long should the potato cores be left in the solutions?

• 36 hours

• 48 hours

• 24 hours

• 12 hours

What does a negative percentage change in mass of the potato cores indicate?

• Error in measurement

• Decrease in mass

• Increase in mass

• No change in mass

What is indicated by a positive change in mass of the potato cores?

• Dissolution of the cores

• No change in water content

• Absorption of water by the cores

• Loss of water from the cores

What should be done if the mass of the potato core decreases?

• Increase the solution molarity

• Record as a negative change

• Repeat the experiment

• Ignore the data

At what point on the graph would you find the exact molarity of the potato core?

• At the lowest point of the graph

• At the highest point of the graph

• Where the line crosses the highest molarity

• Where the line crosses zero