Instructables
I'll show you something neat you can do with some easy to obtain acid.


 
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Step 3: Now for the bubbly! (and an explanation)

Put the penny in the glass with the exposed zinc facing up.

Next, pour in just enough acid to cover the top of the penny.

Leave it for several hours or overnight.

So what's going on in the glass?

The composition of U.S. pennies changed in 1982.

Before 1982 (for about 20 years), pennies were an alloy of about 94% copper and 6% zinc.

The increasing cost of copper made this impractical. Therefore, some 1982 pennies and all
pennies produced after that time have a pure copper shell with a zinc interior.

The new pennies contain only about 2.4% copper and weigh 2.5 grams as opposed to the 3.1-gram weight of the older type.

Zinc is a more active metal than copper. In this experiment, we see that zinc will react
with acid to produce hydrogen gas:

Zn(s) + 2 HCl(aq) => ZnCl 2(aq) + H 2(g)

The hydrogen gas generated by the reaction will bubble up because it is less dense
than the penny and the acid solution.

However, towards the end of the reaction some bubbles of hydrogen may adhere to the copper or be trapped inside the shell. If this occurs, the combination of copper and hydrogen gas may be less dense than the acid solution and what is left of the penny may float!
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Grimling7 years ago
When i readed : Fun With Acid! , i was really hoping it would be an instructable about our good friend , Lycergic Acid Diethylamide :p Nice Instructable anyhow
what is 'Lycergic Acid Diethylamide'?
lysergic acid diethylamide also known as LSD, is among many hallucinagens. LSD was created by albert hoffman. look it up on wikipedia, it'll tell you all about it.
lol, 'daddy, that funny chemical made me see things'......
I've seen things! I've seen them with my eyes! I've seen things, they're often in disguise!
THE ACID IS CALLED DURANGAD INSULATED COLMEAD KINETIS ACID ALSO CALED dick
x z i t x z i t6 years ago
LOL JK
a powerful hallucinogenic substance. (also known as, "gettin' high, dude")
I love that friend.
Kataze Grimling7 years ago
Ah, good times.... XD
lemonie Kataze7 years ago
Oh yes L
Silas Grimling7 years ago
:-D
macingtosh4 years ago
does it wok with old muratic acid because ive had some in my garage for about 3 years and also how can you trick someone if the dime dosent have the other side of the penny
Kiteman7 years ago
"Don't breath the fumes" No problem breathing the fumes - they're competely non-toxic. They do, however, go bang - It's hydrogen. Leave an inverted tub over the penny to collect the bubbles, you can celebrate getting your (quite excellent) penny shell by lighting the hydrogen!
I depends on the molarity of the acid, HCl produces Chlorine gas naturally, which is one of the most notorious killing devices known to man.
Not when reacting with metals: HCl + metal -> metal halide (salt) + hydrogen gas.
Yes, but any unreacted HCl will still put out chlorine gas, and since these are amateur chemists they probably won't balance the moles, and while he gives measurements, not everyone will follow these.
Kiteman, I thinks thats the first time you've had fun on 'Ibles...
Fine, fine, but the first time having fun with chemistry, and not the social kind. Plus, I haven't been on ibles for about 4 months...
laci37 Kiteman5 years ago
After the first smell you will consider berathing it again because the hydrogen-chloride goes out of the heated solution, and it is irritating.
NK5 (author)  Kiteman7 years ago
I was referring to the fumes of the muriatic acid, actually. Those are quite noxious.
mellis19954 years ago
wow that is really cool would it work with 1p and 2p coins to
sharlston5 years ago
nice ible its really cool and well written :)
dhdishner5 years ago
Put it in a plastice 20oz coke bottle (1/4 way full) add a couple foil balls and close it up..... mustard gas bomb.... and you all say you cant have fun with acid!!!
That's not mustard gas! Do NOT try to make mustard gas becasue that's NEUROtoxic(it affects your brain). With this bomb the sound of the exploding hydrogen or your hurting lungs will affect your brain not the gas...
A) What you described is a felony to detonate in public areas. B) Neurotoxins arent something many people can make in their backyard.
Sunny1246136 years ago
how can you have fun with acid? It burns....
how can you NOT have fun with acid? IT BURNS!!!!! cheers, (and safety) mspark400
yah,your right.I have GOT to try it on my bros...... mwahahaha....
Ouch...
I've gotten it on my skin before, it itches.
Oh ok man did it burn?
Stung a little bit, felt like touching a stinging nettle plant. I only got burned because I was stupid enough to forget about washing it off.
nice
Why shouldn't you put water in acid? That should just dilute it. Also would an aqueous solution of hydrochloric acid work?
The reason to add acid to water is that many acids boil at low(ish) temperatures and heat up when combined with water. If you add acid to the water, you end up diluting the acid out very quickly, raising its boiling temperature closer to that of the water. Hot water with a little bit of acid in it is no big deal. If you add water to acid, the first few drops of water mix up and create heat in a very concentrated acid mixture. This can boil or fume or worse. Hot acid with a little bit of water in it is a problem.
HCl(hydrogen-chloride) is not a liquid, it's a gas, hidrochloric acid can be mixed safely with water since it's the solution of HCl, but do not try this with sulfuric acid, because the water boils because of the exothermal reaction and the acid can go out of the container. If you want thin sulfuric acid you need to mix aysmall amount (few drops) of sulfuric acid with much water, because the water absorbs the heat of the reaction.
Adding water to HCl is an exothermic reaction. If you add water to the acid there's a chance that it will splash up and get you on the skin or in your eyes. You always slowly add the acid to water. Not water into acid.
lemonie skegger7 years ago
Yes, you're right. Concentrated sulphuric is quite exothermic, you need a bit of stirring even if you are doing it in the right way L (Hydrogen-bonding)
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