Making it COLD!

[Uriahdribble]

Salt peter, Sal Ammoniac, and Sodium Sulfate powders mixed into water.

I have a century old notebook that indicates about 4 oz. (1.3 oz. of each of the above 3 chemicals (powdered THEN mixed)) per gallon of water will absorb enough heat to reduce the temperature to as little as -20 degrees F for as much as 15 minutes or more.

I would appreciate it if someone could provide the results of the reaction, including the heat absorbed (preferably in BTUs, but I can convert CGS units).
Additionally, is it possible to guesstimate the approximate time for the solution to achieve equilibrium?

Presumed left side of the reaction equation:
KNO₃ + 2NH₄Cl + Na₂SO₄ + H₂O =

What is the corrected complete equation?

[Vitalii]

Salt peter, Sal Ammoniac, and Sodium Sulfate powders mixed into water.

I have a century old notebook that indicates about 4 oz. (1.3 oz. of each of the above 3 chemicals (powdered THEN mixed)) per gallon of water will absorb enough heat to reduce the temperature to as little as -20 degrees F for as much as 15 minutes or more.

I would appreciate it if someone could provide the results of the reaction, including the heat absorbed (preferably in BTUs, but I can convert CGS units).
Additionally, is it possible to guesstimate the approximate time for the solution to achieve equilibrium?

Presumed left side of the reaction equation:
KNO₃ + 2NH₄Cl + Na₂SO₄ + H₂O =

What is the corrected complete equation?

No chemical reaction happens in this case. Salts are ionized by the water and that takes the heat from the solution:
KNO₃(s) = KNO₃(aq)
NH₄Cl(s) = NH₄Cl(aq)
Na₂SO₄(s) = Na₂SO₄(aq)
or the a same but in the net ionic form:
KNO₃(s) = K⁺(aq) + NO₃^-(aq)
NH₄Cl(s) = NH₄⁺(aq) + Cl^-(aq)
Na₂SO₄(s) = 2Na⁺(aq) + SO₄^2-(aq)

[Uriahdribble]

Does that mean that after equilibrium has been achieved and the solution returns to ambient temp. I can evaporate the water off and then dry and re-use the chemicals over and over? If so that would be fantastic.

[Vitalii]

Yes, but you should be accurate with NH₄Cl it easily decomposes:
NH₄Cl(s) = NH₃(g) + HCl(g)

[Uriahdribble]

Please clarify "be accurate with NH₄Cl" What is the best way to dry this mixture safely and accurately?
I think the Na₂SO₄ will have to be in the anhydrous state to work again. I don't think decahydrate will work, but may be wrong.

[Vitalii]

You should not overheat NH₄Cl ... boil slowly ...
I think that NaSO₄*10H₂O is what you use in the first place. And that's what you will get after the crystallization.

[rajan84]

I just started a new job, and am full of new germs, and being stressed, so I developed a really bad head cold. My throat is completely fine, and my lungs are fine, I just have a stuffed runny nose and this is making my mouth dry, and my nose sore.

It feels like a constant headache because my nose is so stuffed, and I'm on my period as well, so I've been taking Cold FX, and Midol daily, but nothing is really helping, I'm still achy and cold all over, how would you go about relieving the pain/fixing the cold?
__________________________________________________
SaaS ITSM change my ip

[expert]

It looks like you have a sinus infection. You may need antibiotics. Go to doctor. To releaf pressue in you mid ear take sudafed. This maybe the reason of constant headaches.