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Topic: Chemical Equilibrium in a saltwater swimming pool  (Read 8464 times)

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Offline popsterrockz

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Chemical Equilibrium in a saltwater swimming pool
« on: March 10, 2010, 04:52:59 AM »
What are the main chemical equilibrium systems that function in a salt water swimming pool? I've been researching this question in google but I couldn't find anything relevant.

My answer is this one:

OCl-(aq) + H+(aq)  ::equil:: HOCl(aq)
 I know there's more chemical equilibrium but I can't find more. Can you please help me?

Offline Schrödinger

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Re: Chemical Equilibrium in a saltwater swimming pool
« Reply #1 on: March 11, 2010, 12:40:40 AM »
What are the main chemical equilibrium systems that function in a salt water swimming pool?
What are the compounds present in a 'salt water' swimming pool?
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Offline popsterrockz

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Re: Chemical Equilibrium in a saltwater swimming pool
« Reply #2 on: March 11, 2010, 12:55:12 AM »
what do you mean? i dont really know

Offline Schrödinger

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Re: Chemical Equilibrium in a saltwater swimming pool
« Reply #3 on: March 11, 2010, 05:34:08 AM »
I thought the words salt and water would help you.

Salt : What salts does water in a swimming pool contain?

Water : What equilibrium is possible with water?
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Offline popsterrockz

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Re: Chemical Equilibrium in a saltwater swimming pool
« Reply #4 on: March 11, 2010, 05:59:03 AM »
H + OH  ::equil:: H2O

for water

i dont know for 'saltwater'

chlorine? HOCL + H2O  ::equil:: OCL + H3O

this is all I know. I dont know about the rest equilibriums. Please help, I need this by tomorrow afternoon

Offline Schrödinger

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Re: Chemical Equilibrium in a saltwater swimming pool
« Reply #5 on: March 11, 2010, 06:09:21 AM »
Quote
H + OH  ::equil:: H2O

Fine, but take care of the charges. (We usually write the reverse, but what you wrote is not wrong)

Quote
chlorine? HOCL + H2::equil:: OCL + H3O
Again, take care of charges.

If chlorine (Cl2) is the only dissolved substance in the water, these 2 equations should suffice.

If you have other salts, like NaCl, then you should also take into account
NaCl  :rarrow: Na+ + Cl-

Although in practice, we assume complete dissociation of ionic salts like NaCl, MgCl2,etc., strictly speaking, we need to consider the reverse reactions also.

Those are all the equations I can think of. Please feel free to add the equations that I have missed.
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Offline popsterrockz

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Re: Chemical Equilibrium in a saltwater swimming pool
« Reply #6 on: March 11, 2010, 06:35:51 AM »
oh sorry for the charges. It's hard to type it in here. What do you mean by 'suffice'?
salt. what about calcium and magnesium, do they dissolve in pool too?
and is it an equilibrium?

my teacher said something about the stabiliser. I'm not sure if this one is right:
CO32+ + 2H+  ::equil:: HCO3- + H+
and then it dissociates to carbon dioxide and water
is that the equilibrium for stabiliser?

 and he said there's more like when the sunlight is affecting pool and the OCL and HOCL get used up

and the buffer equilibrium. What is the buffer one?

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