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acid rain and carbon cycle?

Discussion of the distribution and abundance of living organisms and how these properties are affected by interactions between the organisms and their environment

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acid rain and carbon cycle?

Postby b1163 » Mon Dec 13, 2010 8:28 am

How does acid rain affect the carbon cycle?
i dont need too much details, just a sentence or two. thanks :)
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Postby JackBean » Mon Nov 07, 2011 3:21 pm

I would mention instability if carbonic acid or even hydrogencarbonate.
http://www.biolib.cz/en/main/

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Re: acid rain and carbon cycle?

Postby Crucible » Mon Nov 07, 2011 4:21 pm

Remember the acids other than Carbonic ( e.g. Sulphuric ) that can make rain acid. Action is different.
When they talk about acid rain, then, especially historically, it's good to remember that they might not have been talking only about carbonic.
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Postby JackBean » Mon Nov 07, 2011 5:19 pm

well, H2CO3 doesn't contribute to acid rains, so it's kind of irrelevant ;) I was going for something else.
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Postby aptitude » Tue Nov 08, 2011 7:06 am

Jackbean, do you mean that acid rain reacts with limestone to form carbonic acid, which decomposes into H2O and CO2?
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Postby JackBean » Tue Nov 08, 2011 7:34 am

not really lime, the rain is not that acidic, but stones and plants are not the only carbon storages
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Re:

Postby Crucible » Tue Nov 08, 2011 12:12 pm

JackBean wrote:well, H2CO3 doesn't contribute to acid rains, so it's kind of irrelevant ;) I was going for something else.

What do you mean "doesn't contribute" ?
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Re: acid rain and carbon cycle?

Postby Crucible » Tue Nov 08, 2011 3:57 pm

What is wrong with this from wiki? One might like to go into detail wrt to issues over "alkalinity", "basicity", perhaps, but wrt to carbonic acid being "irrelevant", I don't get it.

"Acid rain" is a popular term referring to the deposition of wet (rain, snow, sleet, fog, cloudwater, and dew) and dry (acidifying particles and gases) acidic components. Distilled water, once carbon dioxide is removed, has a neutral pH of 7. Liquids with a pH less than 7 are acidic, and those with a pH greater than 7 are alkaline. “Clean” or unpolluted rain has a slightly acidic pH of over 5.7, because carbon dioxide and water in the air react together to form carbonic acid, but unpolluted rain also contains other chemicals. A common example is nitric acid produced by electric discharge in the atmosphere such as lightning. [1] Carbonic acid is formed by the reaction

H2O (l) + CO2 (g) is in equilibrium with H2CO3 (aq)

Carbonic acid then can ionize in water forming low concentrations of hydronium and carbonate ions:

H2O (l) + H2CO3 (aq) is in equilibrium with HCO3− (aq) + H3O+ (aq)

Acid deposition as an environmental issue would include additional acids to H2CO3.
http://en.wikipedia.org/wiki/Acid_rain#External_links
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Re: acid rain and carbon cycle?

Postby JackBean » Tue Nov 08, 2011 4:04 pm

this:
wiki wrote:Distilled water, once carbon dioxide is removed, has a neutral pH of 7.

distilled water does have pH 7 without removing anything, since distilled water should be pure, w/o any CO2 :)

Anyway, CO2 is not the main acidifying factor. At least, if we speak about industrial pollution
http://en.wikipedia.org/wiki/Acid_rain# ... dification
wiki wrote:The most important gas which leads to acidification is sulfur dioxide. Emissions of nitrogen oxides which are oxidized to form nitric acid are of increasing importance due to stricter controls on emissions of sulfur containing compounds.
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Re: acid rain and carbon cycle?

Postby Crucible » Tue Nov 08, 2011 4:26 pm

JackBean wrote:this:
wiki wrote:Distilled water, once carbon dioxide is removed, has a neutral pH of 7.

distilled water does have pH 7 without removing anything, since distilled water should be pure, w/o any CO2 :)
There is a world of difference between "should be" and "is", Jack :D
The CO2 in the condensation tube goes right back into the water. Often the pH of distilled water is below 6.
Wiki can hardly be faulted for mentioning it that way.
As well, if distilled water is pure, then why does industry or lab sometimes demand "double distilled" ?
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Postby JackBean » Tue Nov 08, 2011 4:32 pm

no, pH of freshly distilled water is pretty close to 7, but if you let it stand for some time, it will drop, because it absorbs some CO2 from air.
Anyway, CO2 is not the main cause of acid rains.
http://www.biolib.cz/en/main/

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