Elementary Productions: Endothermic reaction

In this experiment, two solid (Ammonium Nitrate and Barium Hydroxide) are added to a beaker. As they react, Ammonia gas, water and Barium Nitrate are produced. This results in a large increase in entropy, which is the measure of randomness in a system. This again causes the temperature to drop, as there is an increase in Enthalpy

Category:

Science & Technology

Tags:

• entropy
• enthalpy
• barium
• hydroxide
• hydrate
• water
• ammonia
• ammonium
• nitrate
• endothermic
• awesome
• chemistry
• interesting
• experiment
• cool
• chemical

[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!

[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!

[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

[misko112100]

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

[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.

[chemiealex]

Yes, but it won't become so cold

[douro20]

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

[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.