 Welcome back to Kids Fun Science. My name is Ken. Today's experiment is the famous iodine clock reaction. As always adult supervision is required. What you need for this experiment is the iodine clock reaction kit. If you look in the descriptions, I put a link where you can get that. So this is a really awesome experiment. As you can get it online, as I showed you the description, you're going to start off and you're going to add chemical solutions to two different cups, which I marked A and B. Both cups come with the with the kit. I've already poured 40 milliliters of distilled water in each cup. And then in cup A, I'm going to add two small scoops of the sodium iodate. The little measuring cups come with the kit, so it makes it very easy and you're going to put those into cup A. You can just pack that down a little bit and then you're set. And then like I said, there's 40 milliliters of distilled water in each cup. Now for cup B, I'm going to add one scoop of sodium sulfate and four scoops of citric acid. So all these chemicals come really nicely in small little containers and they're labeled very well. And so you use the scoops and you're going to put these into B and we're going to do four scoops of the citric acid. And I did one scoop of the sodium sulfate. The directions are inside the kit, so it makes it very easy to do this experiment and you could do it over and over as I've only bought one kit and I've been using it for well over five years. So once you get those in, then we're going to take our liquid starch. It comes with the kit. You're going to get that really good shake. You want to shake it up very well and then you're going to put eight drops into cup B and then we are going to stir both cups very well. Now we're going to stir these up with popsicle sticks. You've got to make sure that all the chemicals are completely stirred up. You don't want any of the chemicals still in the bottom. You can see it. So stir those very well and what you're going to have to do is supply yourself a plastic clear cup that I will bring in. We're going to pour both A and B into one single cup and they do not supply this cup in the kit, so you're going to need to get in yourself. And so I got one right here and once we put the cup out, we're going to pour A and B into the single cup in the middle at the same time and in about 15 seconds or so it's going to do a complete reaction which is hence the name the iodine clock reaction. So we get both of these pour them in and I give it a little swirl and we shouldn't see any color if we didn't mix it completely right. So we're seeing a little bit of color on the bottom so it could have mixed it a little bit wrong, not enough one of the other chemical. So we're coming close to about 10 seconds and we're getting really close, 5th, 11th, boom, it goes beautiful. All right and the science behind this is iodine has two different oxidation states where one iodine molecules have a negative charge and the others where they have no electric charge. So only the iodine with the no electric charge can combine with starch to make the blue-black color. When solutions A and B are first mixed, all the iodine have a negative charge. When the two separate reactions begin reaction one oxidation changes all the negative charges to the no electric charge but reaction two reduction is faster and it changes the negative charge right back to the electric charge. So it has no chance to combine the starch. The iodine zooms back and forth between two states of thousands of times a second. Of course you can't see this until all of a sudden the chemicals that make the reaction two happen are all used up and then it's time for reaction one to change all the negative back into the electric charge the last time and it combines with the starch and then you have ink and that's the famous iodine clock reaction. So if you ended up blinking you're gonna end up missing the whole reaction it's that quick. So I hope you enjoyed this video remember to click thumbs up or share. I do a new video every day and thanks for watching.