big question about boiling water

[Kithikor]

...so it´s not really necessary unless you want to boil off the chlorine ...

Most water purification in the U.S. uses chloramine. That stuff you can't boil out nor can you let it precipitate out. A local store sells water filters, but you have to make sure that the filter will remove chloramine. My city tap water has a certain smell of chlorine, almost like pool water. So when I make my beer, I just go to my local super market and buy bottled water. After initial cost of container, water is 39 cents a gallon. And since tea and beer is mostly water...

[entropyembrace]

I believe you mix up the chemistry a bit here. Air doesn't "react" with water, it gets dissolved.

That is correct. But earlier on you talked about breaking bonds through heat to set free Nitrogen. Molecular bonding does not occure through solution. It would need chemical reaction.

Just a side note...you´re right that there aren´t molecular bonds between species in solution but there are other, weaker types of bonds present...in the case of N2 dissolved in solution this would be interaction between random instantaneous dipole moments (unbalances in the N2 molecules electron distribution which temporarily makes the N2 molecule have a small polar electrical charge) and the powerful permanent dipole moments on the water molecules. These types of bonds are what makes the solution behave as a liquid, if they weren´t present you´d have an ideal gas instead. The energy of these bonds is much lower than the energy in molecular bonds, so they can be broken easily by the heat involved in boiling water...and in fact the energy of these bonds holding the N2 in solution is much lower than the energy of the bonds between water molecules so skarphedin was in fact correct in saying that heating water breaks bonds between N2 and H2O molecules and drives the N2 out from solution.

Just basic chem 101

[entropyembrace]

...so it´s not really necessary unless you want to boil off the chlorine ...

Most water purification in the U.S. uses chloramine. That stuff you can't boil out nor can you let it precipitate out. A local store sells water filters, but you have to make sure that the filter will remove chloramine. My city tap water has a certain smell of chlorine, almost like pool water. So when I make my beer, I just go to my local super market and buy bottled water. After initial cost of container, water is 39 cents a gallon. And since tea and beer is mostly water...

I was thinking of Mexico City´s tap water which is treated with Sodium hypochlorite which can be decomposed and boiled off at 101ºC

[Alex]

until fish eye size

What sort of fish? Full grown tuna? or neon tetras? lol

[Marco]

For something related, but different: How many of you use bottled water when brewing tea, and why? Just out of curiosity.

I did the experiment comparing with bottled water (Volvic and Gasteiner vs. tapwater) once. The reason was that our tapwater is excelent but very hard water. And those two bottled waters are very soft.
My very personal result has been that the tea is not better with the soft water. For others this might be wrong, but for me our tapwater is the better choice.

Just basic chem 101

Think your knowledge about chemistry is better and fresher than mine

[edkrueger]

until fish eye size

What sort of fish? Full grown tuna? or neon tetras? lol

That is actually a good question. I would say fancy goldfish size.