Science Experiments

Making a Dilution Series

Aim: To make a dilution series to investigate concentration.

Equipment: A potassium permanganate crystal, six large test tubes, tweezers, a plastic transfer pipette, a test tube rack, 10 ml measuring cylinder

Method:
1. Place six test tubes in a test tube rack. Label the rack with numbers 1-6 
2.Using the measuring cylinder, Fill test tube 1 with 10 ml of water.Fill the remaining test tubes with 5 ml of water.
3.Using your tweezers, add a single crystal of potassium permanganate to test tube one.
4.Gently shake the test tube until the crystal has dissolved.
5.Using the transfer pipette, Carefully remove exactly 5ml from test tube 1 and pour it into the test tube.
6.Rinse the transfer pipette thoroughly to ensure that no purple solution remains.
7. Gently shake test tube two and repeat the transfer process, Transferring exactly 5 ml of solution from test tube 2 to test tube 3.
8. Rinse the pipette again and repeat the transfer to test tubes 4,5 and 6.

Observation: As I was observing the color changing one by one I noticed that the color was getting weaker.

Discussion: We discussed the changing of the colors and how everything changed about the experiment.