Home science: vitamin c iodine clock

Put on those safety goggles and mash the 1000 mg Vitamin C tablet by placing it into a plastic bag and crushing it with a rolling pin or the back of a large spoon. Get it into as much of a fine powder as possible. Then put all the powder in the first cup and add 2 ounces (60 ml) of warm water. Stir for at least 30 seconds. (The water may be a little cloudy) Let's call this "LIQUID A"
Now put 1 teaspoon (5 ml) of your LIQUID A into a new cup and add to it: 2 oz (60 ml) of warm water and 1 teaspoon (5 ml) of the iodine. Notice the brown iodine turned clear! Let's call this "LIQUID B." By the way, you're done with LIQUID A - you can put it aside.
In the last cup, mix 2 oz of warm water, 1 Tablespoon (15 ml) of the hydrogen peroxide and 1/2 teaspoon (2.5 ml) of the liquid starch. This is, you guessed it, "LIQUID C"
Okay, that was a lot of preparation, on to the fun part. Gather the friends and family and pour all of LIQUID B into LIQUID C. Then pour them back and fourth between the 2 cups a few times. Place the cup down and observe....be patient....somewhere between a few seconds and a few minutes, the liquid will suddenly turn dark blue!

[jadeprotacio]

well explained! .it helps me a lot in my experiment on vitamins. thanks bro..

[thaliamadiamadness]

Thanks so much for this video. It makes understanding simple and easy. Keep it up!

[bristoltandy]

this was the most helpful video i found :)

[matthewlincoln]

I tried this demonstration myself and the liquid did not suddenly become blue as yours did. It more, changed colour over several seconds, and it turned orange haha i guess that could be explained by the fact my solution A was orange dur to the vitamin C tablet (couldnt find colourless ones) and juat double checking. You definitely are using 3% hydrogen peroxide yes?

[stevenlovesscience]

Hi James! Thanks for your question, as long as you keep the individual concentrations of B and C the same and react them at the same ratio, you have have no problem scaling the reaction up or down as you please. So to be more concise yes it should still work if you halve the amounts.

[jamesdunne]

Hi Steven, Could you tell me if this experiment would still work if you halved the amount of liquid in both cups of LIQUID B and LIQUID C?

[CCCC-fseo]

I tried the experiment in a lab, and higher temperature definitely speeds up the reaction. However, I was quite confused on all the concentration factors. Could someone possible tell me the change on the rate of reaction when increasing concentration of each solution (ascorbic acid, iodine, starch, and H2O2)? Just to make sure

[Appo]

Poor audio, definitely too much talk to fit in the average yt users attention span. Otherwise a cool video, good luck with your channel bro.