Aim:
To make a dilution series to investigate concentration.
Equipment:
- A potassium permanganate crystal
- six large test tubes
- A plastic transfer pipette
- A test tube rack
- 10ml measuring cylinder
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 test tube 1 with 10 ml 0f water. fill the remaining test tube with 5ml 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 5ml from the test tube 1 and pour it into the 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 5ml 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.
2. Using the measuring cylinder, fill test tube 1 with 10 ml 0f water. fill the remaining test tube with 5ml 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 5ml from the test tube 1 and pour it into the 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 5ml 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:
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