Dilution Experiment.

In class on monday, we did an experiment using water and potassium permanganate. 

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. label the rack with numbers 1-6.

2: Using the measuring cylinder, filln 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 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 purple solution remains. 

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

Results-

Conclusion/ discussion-  

I saw that the colour of the liquid changed everytime we added the potassium permanganate. test tube number 1 is most concentrated than test tube number 6, so that's why number 6 is more lighter.

Filtration Experiment

Today in hurumanu 3, we were doing chemistry we did a filtration experiment.

Aim: To separate a solution from a precipitate ( precipitate is the name for a solid that forms in a liquid during a chemical reaction).

Hypothesis:I think everything is going to go through the filter.

Method: 

1. Pour approximately 50mL of copper sulfate solution into a beaker.

2. Add the same volume of sodium carbonate solution. A reaction will happen, you should see a cloudy blue precipitate form. Called copper carbonate. 

3. Watch demo then fold filter paper to fit inside the funnel

4. Place the funnel with the filter paper inside of it, into the mouth of a conical flask. 

5. Stir the mixture in the beaker, then carefully pour it into the funnel. 

6. Observe what happened.

Observations: After we put it in the funnel, it went through and turned clear.