Question

a classmate measured the change in mass of potato tissue pieces exposed to different sucrose solutions, just as you did in lab.
which of the following is true about the figure below, which shows their results? (choose all that apply)
chart: % change in mass vs sucrose concentration (m), with line equation y = -85.714x + 20.714, r² = 0.9862
options:

• the 0.5 m sucrose was hypertonic to the potato tissue.
• water flowed into the potato cells in 0.1 m sucrose.
• salts flowed out of the potato cells in 0.1 m sucrose.
• the potato and surrounding solution were isotonic at about 0.2 m
• the 0.5 m sucrose was hypotonic to the potato tissue.

Explanation:

Step1: Analyze 0.5 M sucrose result

The graph shows negative % change in mass at 0.5 M, meaning water left potato cells (hypertonic solution). So "The 0.5 M sucrose was hypertonic to the potato tissue" is true; "hypotonic" is false.

Step2: Analyze 0.1 M sucrose result

Positive % change in mass at 0.1 M means water flowed into cells (hypotonic solution). Salt flow isn’t indicated (osmosis is water movement). So "Water flowed into the potato cells in 0.1 M sucrose" is true; "Salts flowed out..." is false.

Step3: Find isotonic point

Isotonic = 0% mass change. The line crosses 0% at ~0.2 M (from graph trend). So "Isotonic at about 0.2 M" is true.

Answer:

The 0.5 M sucrose was hypertonic to the potato tissue, Water flowed into the potato cells in 0.1 M sucrose, The potato and surrounding solution were isotonic at about 0.2 M