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Iodine Clock Reaction

Autopause

Materials

1 Bottle of Hydrogen Peroxide
1 Bottle of Hydrogen Peroxide
1 Bottle of Sodium Iodine
1 Bottle of Sodium Iodine
1 Puff of Starch
1 Puff of Starch
1 Vitamin C Tablet
1 Vitamin C Tablet
1 Measuring Cup
1 Measuring Cup
1 Petri Dish
1 Petri Dish
3 Plastic Cups
3 Plastic Cups

Instructions

STEP 1
0:00

Reach into your kit and pull out the bag that says Experiment 3. Take everything out of the bag and place it around the white mat. Then, place the empty bag back in your box.

STEP 2
0:20

The bottles of liquid are color-coded. Start by matching the blue bottle with the puffy starch. Then match the green bottle with the little vitamin c tablet.

STEP 3
1:11

First, let’s start with the blue bottle. Uncap and remove the seal. Drop in the puffy starch, if it doesn’t fit, simply squish it a bit to make it smaller.

STEP 4
1:28

Next, screw on one of the squeeze lids tightly and shake it for 10 seconds.

STEP 5
1:54

Now, let’s setup the green bottle. Just like before, uncap, remove the seal, and this time, drop in the Vitamin C. tablet. Screw on the other squeeze lid and shake for 10 seconds.

STEP 6
2:31

Next, grab the round petri dish and place it in the center of your mat.

STEP 7
2:43

Next, twist to open the top of the blue bottle. Gently squeeze, and fill the measuring cup with 12.5ml. Pour the liquid from the measuring cup into the petri dish.

STEP 8
3:17

Next, let’s do the same thing with the other bottle. Twist to open the top of the green bottle and fill the measuring cup with 12.5ml.

STEP 9
3:30

Pour the liquid from the measuring cup into the petri dish. Wait about 10 seconds to see the reaction. It turned blue!

STEP 10
4:08

Pour the blue liquid from your petri dish into one of the empty cups provided and repeat the steps above to watch this reaction again. You can even spay the destain into the petri dish to make it change back to clear.

STEP 11
6:26

Now, clear your workspace and place the two empty cups in the center. Let’s see what happens when we do this same experiment in cups.

STEP 12
6:51

Start by filling the measuring cup all the way up with the liquid from the blue bottle. Then pour all the liquid in your measuring up into the large empty cup.

STEP 13
7:04

Repeat the same steps with the green bottle. Fill the measuring cup all the way up then pour it into the last empty cup.

STEP 14
7:14

Mix the liquids together by pouring one cup into the other. Do this back-and-forth three times.

STEP 15
7:36

Now, let’s count to see how long it takes for the reaction to happen!

STEP 16
7:51

Finally, let’s try it again but this time with different amounts. This time, fill the entire measuring cup with the liquid from the blue bottle and pour it into the other empty cup.

STEP 17
9:20

Next, only fill ½ of the measuring cup with the liquid from the green bottle and pour it into one of the empty cups.

STEP 18
9:34

Now let’s mix them together three times and start counting, just like before.

STEP 19
10:02

Now let’s try it once more. This time fill only half of the measuring cup with the liquid from the blue bottle and pour it into an empty cup.

STEP 20
10:11

Then, fill the entire measuring cup with the liquid from the green bottle and pour it into the other empty cup.

STEP 21
10:19

Now mix the cups together again three times and start to count. Do you notice changes in the timing this time? This time it happened much slower!

How It Works

This experiment is another type of chemical reaction called a clock reaction. It’s called a clock reaction because you literally count to see how long it takes the color to change. This delay happened because there are two chemical reactions happening at the same time and they are competing with each other.

Two of the chemicals want to make it clear and the other two want to make it blue. They compete like a game of tug-of-war. At first, the clear team is winning, but it gets tired out and all used up, so eventually, the blue team wins. This means that the amount of chemicals we mix in can change how long the countdown takes.
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