Dilution Experiment.

In class on monday, we did an experiment using water and potassium permanganate. 

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 the six test tubes in a test tube rack. label the rack with numbers 1-6.

2: Using the measuring cylinder, filln test tube 1 with 10 mL of water. Fill the remaining test tube with 5 mL of water.

3: Using your tweezers, add a single crystal of potassium permanganate to test tube 1.

4: Gently shake the test tube until the crystal has dissolved.

5:Using the transfer pipette, carefully remove exactly 5 mL from test tube 1 and pour it into test tube 2.

6: Rinse the transfer pipette thoroughly to ensure that no purple solution remains. 

7: Gently shake test tube 2 and repeat the transfer process, transfering exactly 5 mL of solution from test tube 2 to test tube 3.

8:Rinse the pipette again and repeat the transfer process for test tubes 4, 5 and 6.

Results-

Conclusion/ discussion-  

I saw that the colour of the liquid changed everytime we added the potassium permanganate. test tube number 1 is most concentrated than test tube number 6, so that's why number 6 is more lighter.