Iodine Clock Reaction
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- Опубліковано 1 чер 2012
- You can try an at home version of this experiment using a few things you may have in your bathroom medicine cabinet. In may ways this experiment feels almost like magic.
What you need:
distilled water (tap water will work OK as well)
a couple plastic cups
1000 mg vitamin C tablets
tincture of iodine (2%)
hydrogen peroxide (3%)
liquid laundry starch
What to do:
Make a vitamin C solution by crushing a 1000 mg vitamin C tablet and dissolving it in 2 oz of water. Label this as “vitamin C stock solution”.
Combine 1 tsp of the vitamin C stock solution with 1 tsp of iodine and 2 oz of water. Label this “solution A”.
Prepare “solution B” by adding 2 oz of water to 3 tsp of hydrogen peroxide and 1/2 tsp of liquid starch solution.
Pour solution A into solution B, and pour the resulting solution back into the empty cup to mix them thoroughly. Keep pouring the liquid back and fourth between the cups.
What’s going on?
There are actually two chemical reactions going on at the same time when you combine the solutions. During these reactions two forms of iodine created - the elemental form and the ion form.
In Reaction # 1 iodide ions react with hydrogen peroxide to produce iodine element which is blue in the presence of starch. BUT, before that can actually happen, the Vitamin C quickly reacts and consumes the elemental iodine.
The net result, at least for part of the time is that the solution remains colorless with excess of iodide ions being present. Now after a short time as the reactions keep proceeding in this fashion, the Vitamin C gets gradually used up. Once the Vitamin C is used up, the solution turns blue, because now the iodine element and starch are present.
Safety Precautions:
Be careful when working with the iodine - it stains, and it stains really well. Be very careful not to spill any of the solution.
Waste Disposal:
Dispose all liquids down the drain with plenty of water.
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This experiment is one of the hardest experiments you would need to do in college/high school for general chemistry if you’re forced into doing it.
who had to watch this for school?
That stream one is extremely trippy.
I'm a 29 year old mother watching this at 1 am and I'm blown away. Haha! I just really like the bit where you can see it all change when he's pouring it, it's absolutely incredible.
It's quite easy and safe to do at home. Even with your children. The ingredients are non-toxic for the most part. The iodine could be a problem if they drank it, but that's nothing some supervision and a warning won't prevent. Especially if you do it while they watch. How much they're involved is obviously at your discretion and depends on age.
All you need is iodine tincture (NOT povidone iodine), which you can get at any pharmacy, feel free to ask them if you can't find it, some regular corn starch, vitamin c tablets, and peroxide. That's it. Nothing fancy. Nothing dangerous. As for actually doing it, there are many videos on UA-cam that explain it. I'll give my own explanation and then link to a credible video with instructions below my own instructions. Which should be pretty much the same. But just in case I forget a detail, you never know.
You start with 2 glasses (preferably clear) that you're going to mix up your ingredients in. In the first glass, add the bottle of iodine, maybe 100ml (4oz) of lukewarm water, and maybe an ounce or two (doesn't need to be exact) of peroxide. The solution should go from a yellowish color to clear, which I think is neat in itself.
Crush up 2 to 4 (2000mg) of the vitamin c tablets and in your second glass pour 100ml of warm to hot water, less than 1 teaspoon of starch, and the vitamin c. The starch never fully dissolves, so it's left cloudy. In the video he filters off the excess starch, but you don't need to bother filtering anything. You can if you want, but it has no bearing on the end results. It's just to make it more clear.
Stir both mixtures for 2-3 minutes to make sure everything's dissolved properly, and you're good to go. Just pour them together, maybe give it a little stir, and hopefully it should work. The beauty part about this is the amounts don't have to be exact, and most of the ingredients are in most houses. I just had a bit of trouble finding the iodine. I had to ask the pharmacist where it was.
Depending on the amounts of peroxide and vitamin c you use, the time it takes to change colors will be longer or shorter. So, play around with it and see what happens. There really is no wrong way to do it. Unless you drink it. lol.
As for clean-up. Everything is safe to just pour down the sink and you can simply wash everything with soap and water. No big deal.
Here's a link to a short (2 min) video by NileRed showing how to do this: ua-cam.com/video/-OqPbuo1S_s/v-deo.html&ab_channel=NileRedShorts
Hope you guys have fun! I cannot encourage you enough to try this. And if for some reason you do it wrong, like I did the first time, don't be afraid to try again. Buy a couple of bottles of iodine just in case. They're only maybe $2 or $3 each. Very cheap.
So it actually changed that fast, I had to watch multiple videos bc I couldn't grasp the concept 😂
Same. I thought it was cap for sure 😂
I want to add your you tube channel to my website. My 11 year old will love this. He is part of a science club and they will love it. Simply wonderful
Cool !
Thanks imagination station, that was an awesome demonstration.
Vitamin C tablets are orange usually; does that work?
Does it work with Alka Seltzer?
really looks like some horror movie substance.
Why would I get red color as soon as I add the two solutions?
noot
Not exactly at the same time. I managed to pause this clip when it had changed above but not yet below.
GG EZ NO RE