sience 9hh

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. Lable the rack with numbers 1-6.
2. Using the measuring cylinder, fill 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 tub 1.
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 in 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, transferring 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.

Observations:   During the expermient,as we added the liwuid from test tube 1 to test tube 2 it started to gewt lighter and lighter each time and started to lose colour as we asdded it to more test tubes.