Making a Dilution

Aim: To make a dilution series to investigate concentration.

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

Method 

1. Place the six test tubes in a test tube a rack, Label the rack numbers 1 too six 

  2. Using the measuring cylinder fill tube one with ten ml of water fill the remaining                 test tube with 5ml water 

3. Using your tweezers add a single crystal of potassium permanganate too test                      tube 1 

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

  5. Using the transfer pipette, carefully remove exactly 5ml from test tube one 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 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 tube 4 5 6 


Here is Our results: 

We were seeing how much water does it take too turn light purple 

Discussion: It got lighter every time we added a small amount of it.