Question

if you put a dialysis bag filled with pure water in a beaker with salt water, your bag ______.

• stay the same.
• lose mass
• break or burst suddenly.
• gain mass

Explanation:

🆕 New Concept Discovered: Osmosis and Tonicity
Water moves to dilute higher solute concentrations.

Step 1: Identify the solute concentrations

The dialysis bag contains pure water, which has a solute concentration of \( 0\% \).
The surrounding beaker contains salt water, which has a higher concentration of solutes (salt) compared to the inside of the bag.

This means the environment outside the bag is hypertonic relative to the inside of the bag.

Step 2: Determine the direction of water movement

Osmosis is the movement of water molecules across a semipermeable membrane from an area of higher water concentration (lower solute concentration) to an area of lower water concentration (higher solute concentration).

Because the pure water inside the bag has a higher water concentration than the salt water outside, water will diffuse out of the dialysis bag and into the beaker to try to balance the concentrations.

Step 3: Determine the effect on the bag's mass

As water leaves the dialysis bag, the volume of liquid inside the bag decreases. Consequently, the bag will shrink and lose mass.

Answer:

lose mass