Dilution Experiment

Definition of Dilution: Making something less concentrated. There will be less particles in the liquid.

A dilute solution contains a small amount of solute.

Concentration: A measurement of how much solute exists within a certain volume of solvent.

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.

hypothesis: My hypothesis will be that test tube 6 will be most diluted because test tube 1 would have more added to it at the start making the first test-tube be the least dilute.

Method: 

1. Place the six test tubes in a test tube rack. Label the rack with number 1 - 6.

2. Using the measuring cylinder, fill the 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 1.

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

5. Using the transfer pipette, carefully remove exactly 5 mL from the test tube1 and or it into test tube 2.

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

7. Gently shake test tube 2 and repeat the transfer process, transmitting 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.

Result:

My hypothesis was correct. The least dilute was test tube 1 and the most diluted tube was test tube 6.

I know this because of the colour difference. If the colour is darker its the least diluted because, dilute means leaser, and if the colour is lighter it would be the most diluted.