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4.6: Agar Cubes (Preparation)

Last updated

Jan 3, 2021
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- 4.5: Observing Osmosis (Activity)
- 5: Cellular Respiration

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Procedures

Prepare a 2% solution of agar.
- Mix 20 g of agar with 1 L of distilled water.
Heat almost to a boil. Stir frequently until the solution is clear.
Remove from heat and add 10 mL of 1% phenolphthalein solution.
- 1 g phenolphthalein in 100 mL 95% ethanol (If pink, titrate with HCl until clear.)
Pour agar into a shallow tray to a depth of 3 cm and allow it to set (overnight).

Silicone Ice-cube trays can be used. It is difficult to find them in the appropriate metric measurements. 3 cm cubes are approximately 1.2 inches and there are molds for this.

Procedures

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