Copper Sulfate Crystal Dehydration
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- Опубликовано: 2 окт 2024
- Here I show the dehydrating power of concentrated sulfuric acid, by immersing a copper sulfate pentahydrate crystal in 96% acid. The acid draws the water of hydration out of the crystal, and causes it to slowly turn white and fall apart over a period of a few months. Sad to sacrifice such a beautiful crystal, but worth it in the end!
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What a beautiful blue crystal that was.
Thanks! They are very easy to grow, it just takes quite a long time to get good quality large single crystals. That's one of the things I've been meaning to make a video on. To prevent dust from getting in, I just use a piece of filter paper over the top of the container. Cheesecloth also works great.
Never mind, you answered my question at the end with the neutralization reaction.
Great question! I've had some crystals out for display for somewhere in the neighborhood of 6 months now and they still look nice! They have faded somewhat, though, and that's because these are hydrated crystals. So, if they are put in a dry environment they'll start to lose some of their water of crystallization and get a sort of cloudy appearance. You might try dipping a finished crystal in lacquer to seal in the moisture (also good to prevent touching the chemical!). That's a great gift idea!
Heh yeah, I know. There wasn't much left in the beaker at the time so it turned out OK. Adding water to the bulk acid at any point before that is definitely a bad idea!
he said 'really nice' loads of times :)
great video (:
I'm pretty sure that would be considered "excessive force." Look up cases where people had sulfuric acid thrown on them and you'll find they are horribly, permanently disfigured. It takes a few seconds to start to do its damage so it wouldn't be effective at stopping someone immediately anyway. Just use mace, it's on the market for a reason.
It's Liquid Fire brand drain opener. The color is likely to either be a dye, added to make it look scary (which is a good thing to do), or suspended particles of carbon, a common contamination in concentrated H2SO4. These types of products are frequently just repackaged industrial waste products from other processes, so they aren't necessarily very clean.
It certainly does - that may be why it didn't dehydrate the CuSO4 all the way to white. If you leave concentrated acid out in the open, it will draw moisture from the surroundings and dilute itself over time. It would just take a while for any visually noticeable change to happen.
I really like your videos, keep on!
Quite wrong! Copper sulfate is perfectly benign (besides being rather toxic to marine life).
A month to grow that?? I have one growing now thats just a few days old and its the size of your crystal in this video
IAA015 Depends on our growing conditions. Your solution probably evaporated much faster or your solution was a different concentration than mine. Slower is generally better for large single crystals, but congratulations on yours!
Sodium fluoride is a salt - therefore it is already neutral.
They're more dangerous to aquatic life than to you, but it is classified as a skin irritant. It's a good idea to at least wash your hands after handling them. One idea I had was to dip these crystals in clear resin, so you can handle them safely and they keep their luster.
I ended up disposing of it - there wasn't all that much of it in there anyway. Copper hydroxide is actually really difficult to make, because it very easily decomposes into CuO. I have yet to make a good batch of it to use for anything.
By the time I was adding the KOH I had diluted the acid quite a bit, as I said in the video. It just heated up a bit is all. I know all about the dangers of concentrated sulfuric acid, believe me.
Great video. I cringed a little when you broke the golden rule of chemistry and added water to acid at 4:41
Luckily nothing went wrong.
Yeah I'll definitely make a video at some point. I wanted to make sure my process worked before I did, and I got some great looking crystals! It just takes a lot of patience :)
Definitely, I just need to get around to doing it again. That's another one that takes a few months to film!
I've made few accidentaly. I left unsaturated solution of copper sulfate over a week on a warm place at my grandma's home. when I got back there were large, 4,5 cm (2 inch) perfect crystals. I kept one and i left it in another, but this time saturated solution for a week. When i got back I was astonished, I saw 12 centimeter long, 5 centimeter wide crystal. Have fun with copper sulfate!
To the comment about acid safety, you can put a drop of sulfuric acid on your hand and it will take about 30 seconds before you feel it. Acids are aver rated, well except for perchloric acid. Interesting demonstration, would be good for high school demonstrations.
I found it much better to just seal it in a vacuum bag or something (I just ducktaped a paper bag shut) with a round bottom 250mL flask filled with some sodium hydroxide and leave it for some months. Also allows you to crumble it and expose more pentahydrate.
Is anhydrous copper sulfate a strong enough dehydrating agent to dehydrate sulfuric acid? The crystals could still be slightly blue because the acid isnt strong enough to dehydrate the copper sulfate completely.
There is less dangerous version of dehydrating that involves propane torch. Just burn the copper sulfate crystals or powder until you get greenish to gray supstance. It's the anhydrous copper sulfate.
Dude, Maybe it'd have been better if u get a beaker and small crystal then heated the crystal it'll take 1 mint I did it a month ago, it was very cool :D...Anyways, great Video keep it up ^^
What a lovely crystal, and a cool demonstration to destroy it with.
dude, i would NEVER EVER pour dissolved KOH into concentrated H2SO4. you were lucky the acid wasn't so concentrated or it would boil and spray acid ant the base all around
Very cool. I had wondered if it would produce some passivation type effect, leaving just a thin outer coating of anyhydrous, but I guess not!
I have often wondered if you could stabilize coper sulfate pentahydrate Crystal by coating them with some waterproofing compound like scotch guard or rainx.
how stable is the crystal? like, if i were to grow my own could i put it in a ring or necklace if it were cut? I want to make something for my girlfriend. :)
You could...but if the base of the coating chemicals you will use dissolves copper sulfate, you will end up with strange - looking crystals.
Hmm... whoops, looks like I made an incorrect assumption.
Also while I'm not an EE like you two I am interested in electronics and will be an EE... one day...
are copper sulfate crystals dangerous, because i have a collection of them and i always touch them....
more than anything its to protect from small drops of splash back not pouring acid over your hand
is there a way of speed up the growth time of copper sulfate by electromagnetism? or some other doping?
Hey, just curious but where did you buy you chemistry supplies and glassware?
lol 4 months of waiting for the anhydrous form just to add water a few minutes later
I think most of the acid was gone when he added the water thank god.
Is not Copper sulfate in it's dehydrated form a high explosive or am i wrong?
That copper is a beautiful crystal :)
Going experiment 😆
how much copper can i desolve using your coil method ? i finally made crystal using car battry acid and your coil method but. will it be better to concentrate barrty acid first? if i keep conecting fresh copper will it desolve forever or will the acid burn off eventually?
Some companies do this, but generally the colour comes from dissolved organic material in the acid. Adding some concentrated hydrogen peroxide to the acid will remove the colour, particularly when heated, by oxidizing the carbon.
chemistry.
working half a year for moments
@AlChemicalLife pleasesend me the link to your new channel
Yeah I was sad to see it go, especially after months growing it! I think it was a worthy sacrifice though. I'll definitely make a video on how I grew them sometime in the future.
0:35
It's colored that way deliberately so as to advertise its hazardous nature. I could be wrong, but dissolved carbon doesn't sound very plausible.
I did this as well just to say I've done it before. And I wanted to let everyone know it only took about 2 days for the acid to completely break down a solid 9 gram crystal of copper sulfate and turn it to anhydrous copper sulfate in my case. That way there's a little more information on the time it takes to to this. (:
like the purity of your crystal,is it difficult to grow?i find dust a problem,how do you get round that?cheers.
How did you grow such a perfect single crystal? I'd like to grow one myself. How large can they get?
Why is your acid brown
At the end, that reaction is actually a method to test the presence of metal ions (in this case, copper). Blue ppt indicates copper in solution.
yay new video!!!!!!!!!
why is ur acid red ?
I did this at school
Very interesting ...
I'm 14 and i love to watch this stuff...! :D I love science
are you going to make a video on how you grow the crystal?
Methyl methyl ketone, or dimethyl ketone.
So cool how did u make the crystal?
finished? :D
lol 4 months later
Sulfuric acid isn't considered a powerful acid. Its actually a pretty weak acid.
Nope it’s very acidic and a very hydroscopic.
What is the name of the waste liquid?
It's just sulfuric acid. Carefully dilute and neutralize with a base.
My dad did this and the neighbour saw the waste and we are afriad that we might get report so what must my dad do?
@@yoonshwezin5515 Carefully dilute and neutralize with a base.
whens new video!?!?!?!?!?!?! neeeed moreeeee :P