Osmosis

Day 1

Objectives

To define the term solution

To give examples of solutions

To distinguish between a concentrated & dilute solution

To define the term osmosis

To demonstrate osmosis in plant material

Solvents, Solutes and Solutions

Solute + Solvent = Solution

Eg

• Salt + water = salt water

• Sugar + water = sugar water

• Lime juice + water = lime water

A solution is either concentrated or dilute depending on the amount of solute

Osmosis is the movement of water across a selectively permeable membrane until both are nearly the same concentration

Water will move from a higher water potential (higher number of water molecules) to an area of low water potential

Water Potential - The measure of the ability to lose water; the higher the water potential the higher the ability to lose water, and the lower the water potential the higher the ability to gain water.

Day 2

Vocabulary

Isotonic - equal water potential between 2 solution

Hypotonic - dilute solution with a high water potential, it loses water

Crenate - shrink(animal cells)

Lyse - Burst(animal cells)

Turgid - In a plant cell, "turgid" means swollen or distended due to water absorption. It occurs when the central vacuole is filled with water, making the cell firm and rigid. Turgidity is crucial for plant tissue structure and support.

Flaccid - In a plant cell, "flaccid" refers to a state where the cell lacks turgor pressure and becomes limp or wilted due to a loss of water.

Plasmolyzed - Plasmolysis is the process in which plant cells lose water and shrink due to the movement of water out of the cell. Plasmolyzed refers to a plant cell that has undergone plasmolysis.

Hyper Tonic - concentrated sol - a low water [ptential; gain water from another solution