Magnetic Stirrer

Reach into your kit & pull out the bag that says Experiment 33. Take everything out of the bag and place on your white mat. Then, put the bag back in the box.

Place the computer fan in the center of the white mat, with the hole in the center, facing down. Then, peel off one side of the clear sticker and place it directly in the middle of the fan.

Next, peel off the top side of the sticker, take out the strong magnet, and place it on top of the sticker.

Next, unwrap your 9 volt battery and only connect it to one side. You are going to use it to toggle like a switch, on and off. Touching the disconnected side to the battery will turn the fan on.

Now, grab the plastic lid and place it on top of the fan so the flat side is not touching the magnet.

Next, grab the little magnetic stir bar and place it on top of the lid, over the magnet. once connected it will move the magnet underneath. Check by turning on the power to the battery to see it spin.

Now take the magnetic stirrer and place it into your plastic cup. Then place the cup onto the top of the fan and turn on the battery to see it spin inside the cup.

Next, fill the cup with water about 3/4 of the way full. Then, turn on the power to the battery to watch it form a tornado effect.

Now, while the liquid is spinning, open the bottle of Bromothymol Blue liquid and squeeze it into the cup of water.

Let’s change the color of the liquid. Open the bottle of Citric Acid and gently squeeze in one drop at a time. Start with a few drops and let it stir, then add a few more drops.

Once your liquid has turned yellow, you can use the first bottle of sodium borate to change it back to blue. Start with a few drops at a time to watch it change back and forth, then add in more to change it fully back to blue.

You can change the color back and forth using both liquids. Try evening the colors to make green by adding one drop at a time until you reach the color your want.