Mini Pracs

Question 1

What is visking tubing and when can it be used?

Answer 1

• can be used in an experiment to act like a partially permeable membrane
• has small pores which will allow small molecules to diffuse through but not large ones
• can be used to produce a model gut
• can also be used to make a model cell and used in experiments to demonstrate osmosis

Question 2

What is phenolphthalein?

Answer 2

And indicator taht is pink in alkaline solutions of pH 10

When pH drops below 8.3 it goes colourless