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Osmosis Membrane Lab

Compare two equal-volume solutions, identify what crosses a selective membrane, and predict the direction of net water movement.

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Selective membrane transport

Two chambers with 100 mL each are separated by a membrane. The left chamber holds 20 sugar units, the right one 35. Water molecules fit through the membrane pores, sugar molecules do not.

Show data as a table

Node	Details
Left solution	100 mL · 20 sugar units · water available
Membrane	water: passes · sugar: blocked · pore width: 0.55
Right solution	100 mL · 35 sugar units · higher solute concentration

Choose one answer

The membrane passes water but not sugar. Each compartment contains 100 mL. The left solution has 20 sugar units and the right solution has 35. Which way is the net water movement?

Toward the right side, which has 35 sugar units.Toward the left side, which has 20 sugar units.

Show a hint

First ask which particle can cross. Then compare the sugar amounts on the two equal-volume sides.

About this activity

What you practise: Separate the permeability rule from the concentration rule, then transfer both rules to a new pair of equal-volume solutions.

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The membrane passes water but not sugar. Each compartment contains 100 mL. The left solution has 20 sugar units and the right solution has 35. Which way is the net water movement? Two chambers with 100 mL each are separated by a membrane. The left chamber holds 20 sugar units, the right one 35. Water molecules fit through the membrane pores, sugar molecules do not. Only water can cross this membrane. The side with more impermeant sugar has fewer free water molecules, so net water movement is toward the right side. The pore-width setting changes the rate in the model, not this direction rule.