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In an experiment designed to measure diffusion potentials, you are provided with a reference electrode and a recording electrode which contains a semi-permeable membrane. Both electrodes are filled with the same standard Thomson solution, and when they are immersed in a 10x solution of the Thomson solution, you record a voltage of 40 mV.

What can you conclude about the membrane permeability of the test electrode assembly?

A. The test electrode assembly's membrane is impermeable.
B. The test electrode assembly's membrane is selectively permeable.
C. The test electrode assembly's membrane is permeable to all ions.
D. The test electrode assembly's membrane is a perfect insulator.

Answer :

Final answer:

The test electrode assembly's membrane is selectively permeable (option b).

Explanation:

Based on the information provided, we can conclude that the test electrode assembly's membrane is selectively permeable (option b). This is because the measurement of a voltage of 40 mV when both electrodes are immersed in a 10x solution of the Thomson solution indicates that some ions are able to pass through the semipermeable membrane while others cannot. In this case, the membrane is permeable to some ions, but not to all ions.

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