Question

1. make a claim about the water potential of the potato. provide evidence and reasoning to support your claim.

claim
evidence
reasoning

• the water potential of the potato is greater than of the 0.2 m nacl solution.
• the water potential of the potato is equal to the 0.2 m nacl solution.
• the water potential of the potato is less than the 0.2 m nacl solution.

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Explanation:

1. Claim Selection: The linear fit line crosses 0% change in mass, which is where the water potential of the potato equals the water potential of the NaCl solution. This matches the second claim option.
2. Evidence: The graph's linear fit for % change in mass intersects the 0% change axis, corresponding to the 0.2 M NaCl solution condition. This intersection means no net water movement between the potato and the solution.
3. Reasoning: When the % change in mass of the potato is 0, there is no osmosis (net water movement) because the water potential of the potato cells is equal to the water potential of the surrounding 0.2 M NaCl solution.

Answer:

Claim:

The water potential of the Potato is equal to the 0.2 M NaCl solution.

Evidence:

The % Change in Mass linear fit on the graph intersects the 0% change in mass axis, which corresponds to the 0.2 M NaCl solution.

Reasoning:

A 0% change in mass means no net osmosis occurs, which only happens when the water potential of the potato cells is equal to the water potential of the external 0.2 M NaCl solution.