Elementary Productions: Endothermic reaction

[KoolioJosh]

my prof did this experiment in class today it went from t1 of 17 degrees to -34 degrees C, it also stuck to its surface and has a horrible smell

[chemicalwarfare224]

how come the water dosent freeze?

[LackOfFuel]

You can do that with ammonium chloride as well.

[orlandodeng]

great!!!

[lambogeek]

ammoium nitrate...explosive

[edificemelody]

So how long does the temperature stay that cold? Could you possibly store this mix into something that would freeze the container it is in and then place it into say a cooler of water and it would keep the water cold? I'm curious if I could have DIY little air cooling system. If it's a dangerous idea then nevermind I guess.

[douro20]

Won't ammonium nitrate and water do the same thing?

[chemiealex]

Yes, but it won't become so cold

[misko112100]

jeez,thats the same reaction,the two substances produce gas and WATER,did u even read what text says :/

[VestriDeusEstMortuus]

isnt ammonia gas 'slightly' toxic?? and you do that in your kitchen??

That's tight.

[11to]

damn thats cold

[adriankocian]

Dear Mabakken!

I have an question.  Will this reaction occure if I use any other Nitrate instead of NH4NO3 to avoid of evolution of ammonia?

[mabakken]

The use of Ammonium Nitrate is essential in this experiment! Other nitrates will not work, as there would not be an equal increase in Entropy!

[elliotmotocross]

barium carbonate in nitric acid makes barium nitrate.. right? Is that a good way to make nitrates?

[mabakken]

Correct! Nitric acid is very often used to make Nitrates!

[elliotmotocross]

Yay, I'm smart. If I added alfoil to Nitric Acid would I get Aluminium Nitrate? If I added something like Sulphur to Nitric acid, What would I end up with?

If I used Potassium for example, to obtain the Potassium Nitrate what do I have to do?

Thanks

[Sebbass69]

Yes, adding aluminum foil to nitric acid would give aluminum nitrate -

From what I understand, adding sulfur to nitric acid (concentrated) will actually yield sulfuric acid, NO2 and water - I'm not sure if this is correct, but that's what I've heard -

Making potassium nitrate out of nitric acid is a waste - potassium nitrate is extremely easy to come by, whereas HNO3 is not -

[Peterditaa]

aluminium doesnt react with hno3. no alunitrate, sry dude

[Sebbass69]

actually, aluminum and nitric acid react very readily - aluminum oxide and nitric acid will not react, and as most aluminum samples are coated with the oxide, they won't react, however, the pure metal will -

[donnelrj01]

@Sebbass69

I'm sure you know this; but for future reference, nitric acid and aluminium do not react to any significant degree. The Al forms an oxide layer preventing it from further reacting almost instantly.

Regardless of how pure and oxide free the metal sample is.

[ExplosiveScience]

To obtain potassium nitrate you would use a different potassium salt, I am not sure about aluminum and sulfur though. If you add pure potassium metal to nitric acid, it would explode or catch on fire, and react mostly with the water and oxygen.

[chemoxid]

yeah but it would be more easy and safer if you use a potassium base like KOH or K2CO3 and of course more adecuated because you cant just go tho the drugstore and say : " -hey , i want some potassium please , -here you have..-oh thanks! see you later bye.

agree?

[Yreetay]

Are the substances you used dangerous if it came into contact with skin

[mabakken]

The Ammonium Nitrate is an Irritant, and the Barium Hydroxide is caustic! You don't wanna get that on your skin!

[SeanBroccoli]

home made instant cold pack!

[thedude77777]

do u cook on that stove?

[mabakken]

It used to cook a lot of fancy dinners, but I wouldn't be using it for experiments if I still cooked on it! ;)

[HumanNitrate]

mkay. but IF that would work wouldn't i have some impurities of barium and ammonium chloride. how could i leech out the barium nitrate?

[mabakken]

I'm sorry, what do you mean? Why would you leech out the Barium?

[HumanNitrate]

umm.. how would i remove the Barium Nitrate from the rest of the solution?

[mabakken]

Yes, but why? This is not a good way to synthesize Barium Nitrate!

[HumanNitrate]

oh. i thought this experiment was to show a Metathesis reaction to produce barium nitrate. guess i was mistaken. but nice video though! :)

[mabakken]

Well, it is a metathesis reaction, and Barium Nitrate is produced, but as you mentioned earlier, it is too impure to be a good synthesis. Good that we got that cleared up :)

[HumanNitrate]

I wonder would using barium carbonate instead of hydroxide would work. its only slightly basic though.

[mabakken]

Barium Carbonate won't work I'm afraid as it is very unsoluble in water.

Try reacting it with Hydrochloric acid first, to get the chloride (which is very soluble). Try using this instead of Barium Hydroxide. I am uncertain of whether it works or not, but it is worth a try.

[adeadlysniper]

Damn, now that baby's COLD!

[iChlomi]

Ughh....Chemistry is TORTURE

[Sebbass69]

would barium chloride work for this reaction?

I know that Barium Chloride and Sodium Nitrate will work, but will barium chloride and ammonium nitrate work?

[mabakken]

I don't know for certain, but I think it will work! Try it for yourself :) Let me know if it works! =)

[crislangpo]

good!

[derkozten]

It is an acid-base reaction, in the sense that ammonium nitrate is a weak acid (because of the NH4+ ion), whereas barium hydroxide is a strong base. The difference is in the completely solid state in which this reaction begins.

[NITROMETHANO]

ammonium nitrate + barium hydroxide = barium nitrate?? how much you used AN and barium hydroxide?????

[mabakken]

The chemical equation for the reaction is as follows:

Ba(OH)2•8H2O + 2NH4NO3 → Ba(NO3)2 + 2NH3 + 10H2O

The reactants was not mixed in a stoichiometric ration, with Ammonium Nitrate being in excess.

[Basco36]

nice.