You Can Investigate Diffusion in a Non-Living Syste, Flashcards
1
Q
What is a phenolphthalein?
A
A pH indicator
2
Q
What can you use phenolphthalein to do?
A
Investigate diffusion in Agar jelly
3
Q
What do you do first?
A
Make up some Agar jelly with phenolphthalein and dilute sodium hydroxide - it will go pink
4
Q
What do you do second?
A
Fill a beaker with some dilute hydrochloric acid. Using a scalpel, cut a few cubes from jelly and put in beaker of acid
5
Q
What do you do last?
A
If you leave cubes for a while they’ll eventually turn colourless as acid diffuses into Agar jelly and neutralises sodium hydroxide
6
Q
How to Investigate rate of diffusion?
A
Using different sized cubes of Agar jelly and timing how long it takes for each cube to go colourless, cube with largest surface area to volume ratio loses colour quickest
