Concentration

11/05/17

Making a dilution series

Dilute- contains a small amount of solute. At home if you were making a weak coffee, in the scientific terms you are making a dilute solution of coffee.

Concentration- contains a large amount of solute something strong like making your coffee strong.

Aim

To make a dilution series to investigate concentration

Method

1} place the 6 test tubes in a test tube rack. Label the rack with numbers 1-6.

2} using the measuring cylinder, fill test tube 1 with 10 ml of water. Fill the remaining test tubes with 5 ml of water.

3} using 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 solutions remain.

7} Gently shake the test tube 2 and repeat the transfer process, transferring exactly 5 ml of solution from test tube 2 

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

Observation

Conclusion

is that when we started the practical the colour of the water when we added the crystal was dark and when we kept repeating the same thing on each test tube and colours became lighter each time.