Duration : 0:14:42

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Boiling down the sodium acetate solution to exactly the right level is key to making sodium acetate work. Since most of you don’t have precise glassware like I do, you can follow this new method of boiling to get the concentration just right.

Simply make a raw sodium acetate solution like in our previous video at this link: http://www.youtube.com/watch?v=jpEZWdPIg9o

But instead of boiling down 90%, just watch the surface of the boiling liquid.

As you pass the key concentration for making hot ice, a crust of sodium acetate will start to form on the surface. As soon as you see this crust take it off heating. While it is still hot, stir the mixture and add a small amount of water, usually just a spoonful or so, to redissolve the crust.

It should still smell like vinegar, if it does not, there was not enough vinegar in the original mixture. So you’ll need to add another quarter-cup to half-cup of vinegar and boil it back down while looking for the crust. Once again stir it and add water.

Keep repeating the vinegar addition and boiling until the boiled liquid has a faint smell of vinegar.

Once you have the clear, hot, vinegar smelling liquid, place a covering it and then cool it in the fridge until it becomes cold to the touch.

Now you’re at exactly the right concentration to do hot ice.

To initiate the crystallization or “freezing” process, just drop in a solid piece of sodium acetate. You can get this by scraping off some of the crust earlier and then saving it separately.

Touching is not a reliable way to initiate crystallization, sometimes it works, sometimes it does not.

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Special Notes:

If you have bad sodium acetate from previous experiments, you can “fix” it by heating it and adding water until it completely dissolves. Then follow the boiling instructions in this video (including the vinegar addition if needed) to fix bad sodium acetate.

But if you have dirty sodium acetate then it won’t be fixable by this method.

I don’t think i’m emphasizing how important the following two points are: IT MUST SMELL LIKE VINEGAR AND BE TOTALLY CRUST-FREE before you can put it into the fridge. Otherwise, it WILL freeze automatically or turn to a mush.

If you want to know the temperature of hot ice as it freezes, click here: http://www.youtube.com/watch?v=CAwxhAP9mnc

If you want to reuse/remelt your sodium acetate after it has solidified, put it into the microwave and heat it until it *just* starts to boil. Then take it out and stir it until it completely dissolves. If it does not completely dissolve even when its really hot then add in water until it dissolves. Once it’s completely dissolved cover it and put it in the fridge.

FAQ: The yellow thing in the bottom when I’m adding the baking soda and boiling is a magnetic stir bar that stirs the ingredients.

Duration : 0:2:28

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With just two simple ingredients you can make sodium acetate!

FOREWARNING: This reaction pretty hard to get exactly right, don’t be discouraged if it fails the first time. Thoroughly read the comments and this description to avoid problems. Finally, if it still doesn’t work, message me and i’ll try to help.

Just get 1 liter of clear vinegar and add in 4 to 5 table spoons of baking soda. Then boil the mixture down to 100mL to 150mL.

A more accurate way of finding how much you need to boil can be found in our latest video: http://www.youtube.com/watch?v=21IcpkxgBVY

It should still smell like vinegar. If it does not, add an equal amount of vinegar and boil it back down. Smelling again for the vinegar. Keep adding and boiling until it does smell like vinegar.

Put it into a jar while it is still hot and cover it. Let it cool down to room temperature and then you can do all those “hot ice” vids you see!

If it turns yellow or brown, that’s ok. But don’t boil it too far or it will burn.

If you have a weigh scale, its MUCH better to accurately weigh your baking soda depending on the percentage of vinegar. Use the following masses per 1 liter of vinegar:

4% vinegar use 56g of baking soda
5% vinegar use 70g of baking soda
6% vinegar use 84g of baking soda
7% vinegar use 98g of baking soda
8% vinegar use 112g of baking soda

Gram scales are very easy to buy online and on ebay. It is highly recommended you get one if you’re serious about chemistry.

When adding the baking soda. Go SLOWLY or it will fizz over and make a mess.

What’s happening is the vinegar contains acetic acid which reacts with the sodium bicarbonate from the baking soda to create sodium acetate.

You need to boil it down because the vinegar contains too much water for the sodium acetate to work as hot ice.

When you want to do the “hot ice” freezing reaction, just warm the mixture over a stove or dip in a hot water bath until it completely melts. A microwave also works. Then let it cool down. If you find it freezes by itself when you’re cooling then you need to make sure you completely melt every last bit of sodium acetate. You can also cover the container to prevent it from drying while cooling down. The drying will cause it to freeze before you can use it. Covering it stops this.

Once it’s liquid and cooled, have fun!

Thanks for watching!

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Special notes:

Sodium Acetate is NOT edible! It’s not toxic but it doesn’t taste very good. So don’t use it as actual ice.

When it quick-freezes it actually warms up. That’s why it’s called “hot ice”. When it’s completely frozen it’ll stop warming up and cool down to ambient temperature.

If you want sodium acetate powder, it’s probably better to buy it directly off ebay. If you want to convert this stuff into a powder then first make sure you got the mixture right and that it actually works as hot ice. Then pour it out on a tray to solidify it and mash it up with a spoon. Leave it to dry overnight and mash it up further if it’s still sticky. Eventually it’ll dry to a powder and you can save it that way.

The yellow thing in the bottom when I’m adding the baking soda and boiling is a magnetic stir bar that stirs the ingredients.

Duration : 0:2:56

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