Lab 05 Data- Finished

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Lab 04 Data Name: Raven Chalmers 1. Starting weights: note, all starting weights should have been 10g – these questions are just confirming that a. How many grams of potato did you initially put into your 0% sucrose container? 10g b. How many grams of potato did you initially put into your 7% sucrose container? 10g c. How many grams of potato did you initially put into your 28% sucrose container? 10g 2. Time: How many minutes did your potatoes sit in their solutions (it should have been at least 120 minutes)? 1 hour and 49 minutes 3. Final weights : a. After about two hours, how many grams did the potato that sat in the 0% sucrose solution weigh? 10.58g b. After about two hours, how many grams did the potato that sat in the 7% sucrose solution weigh? 11.8g c. After about two hours, how many grams did the potato that sat in the 28% sucrose solution weigh? 9.43g

4. Calculating net change – to find the percent change, subtract the initial mass from the final mass, i.e. “final – initial = net change”. You must include a sign for all numbers, + or – depending on if it gained or lost weight. a. What was the net change in weight for the potato that sat in the 0% sucrose solution? +.58g b. What was the net change in weight for the potato that sat in the 7% sucrose solution? +1.8g c. What was the net change in weight for the potato that sat in the 28% sucrose solution? -.57 5. Percent change: to calculate the percent change, take the net change and multiply it by ten. (Technically, we are dividing by the starting mass, 10g, then multiplying by 100 – I am just simplifying it to save you a step!). Be sure to include a sign, + or -, for all changes! a. What was the percent change in weight for the potato that sat in the 0% sucrose solution? +5.8% b. What was the percent change in weight for the potato that sat in the 7% sucrose solution? +18% c. What was the percent change in weight for the potato that sat in the 28% sucrose solution? -5.7% 6. Significant movement: if any potato experienced a gain or loss of more than 5% of its initial mass, this indicates a significant movement of water. If the potato did not gain or lose more than 5% of its original weight, it did not

experience a significant movement of water. For your answers below, if there was a significant movement of water, include whether the movement of water was into the potato cells, or out of the potato cells. a. Was there a significant movement of water into or out of the potato that sat in the 0% sucrose solution? No there was not a significant movement of water b. Was there a significant movement of water into or out of the potato that sat in the 7% sucrose solution? No there was not a significant movement of water c. Was there a significant movement of water into or out of the potato that sat in the 28% sucrose solution? Yes there was a significant movement of water out of the potato. 7. Tonicity – use your answers above to answer the following questions a. Is 0% sucrose hypotonic, isotonic, or hypertonic to potato cells? Hypotonic b. Is 7% sucrose hypotonic, isotonic, or hypertonic to potato cells? Hypotonic c. Is 28% sucrose hypotonic, isotonic, or hypertonic to potato cells? Hypertonic

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