Calculating the Effects of Osmosis Flashcards

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What is the formula for percentage change in mass in an osmosis experiment?

Percentage change = (final mass – initial mass) / initial mass * 100.

A potato cylinder goes from 12.0 g to 10.5 g. What is the percentage change in mass?

Change = -1.5 g; (-1.5/12.0)*100 = -12.5%.

A potato chip goes from 5.0 g to 6.5 g. What is the percentage change in mass?

Change = +1.5 g; (1.5/5.0)*100 = 30%.

What does a negative percentage change in mass show in osmosis results?

The sample lost water; water moved out of the cells.

How do you calculate the rate of osmosis using mass and time?

Rate = change in mass / time taken (e.g., grams per minute).

A chip gains 0.9 g in 15 minutes. What is the rate of mass change?

0.9/15 = 0.06 g per minute.

How do you calculate percentage change in length for a plant strip?

Percentage change = (final length – initial length) / initial length * 100.

A strip goes from 40 mm to 44 mm. What is the percentage change in length?

Change = +4 mm; (4/40)*100 = 10%.

On a graph of % change in mass against sucrose concentration, how do you find the isotonic point?

It is where the line crosses 0% change.

The line crosses 0% at 0.30 mol/dm^3 sucrose. What is the approximate concentration of the cell sap?

About 0.30 mol/dm^3 (isotonic with the cells).