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  1. #1
    "JFT Boys" u5711's Avatar
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    why does unboiled deionized water have a pH less than 7?

    ??
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  2. #2
    Registered User beernuts's Avatar
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    Uhh it doesn't.
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  3. #3
    Member PIITB.'s Avatar
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    Originally Posted by u5711
    ??
    bro thats elementary chemistry

    X*(323* ph level(3432-) ( salinity of ph) = PIITB
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    Originally Posted by beernuts
    Uhh it doesn't.
    wrong
    "Like those in the valley behind us, most people stand in sight of the spiritual mountains all their lives and never enter them, being content to listen to others who have been there and thus avoid the hardships."
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  5. #5
    Registered User beernuts's Avatar
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    Originally Posted by u5711
    wrong
    Why'd you ask if you already knew the answer? In pure deionized water, there are equal amounts of H+ and OH- ions, thus giving you a pH of 7. Since you included the word "unboiled," are you implying that it's possible that contaminants might exist in the deionized water in question? If so, then yes, these contaminants would alter the pH away from 7. I just don't know what you're asking. Tell me what you're thinking.
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    My first guess would be atmospheric CO2 dissolving into the water and creating HCO3-, CO3-, etc. These would make it acidic. Boiling the water would possibly reverse the process and keep it that way as long as the water container was sealed.
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    Originally Posted by beernuts
    Why'd you ask if you already knew the answer? In pure deionized water, there are equal amounts of H+ and OH- ions, thus giving you a pH of 7. Since you included the word "unboiled," are you implying that it's possible that contaminants might exist in the deionized water in question? If so, then yes, these contaminants would alter the pH away from 7. I just don't know what you're asking. Tell me what you're thinking.
    The analytical grade water I've seen and used is slightly acidic. That confused me too. Diab0lic's theory sounds reasonable.
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  8. #8
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    Originally Posted by Brinn
    The analytical grade water I've seen and used is slightly acidic. That confused me too. Diab0lic's theory sounds reasonable.
    Gotcha. I was under the impression that this was pure deionized water, with no contaminants.
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  9. #9
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    Talking

    Originally Posted by PIITB.
    bro thats elementary chemistry

    X*(323* ph level(3432-) ( salinity of ph) = PIITB
    close, but a little off, you forgot the squared sign in piitb.

    Heres the correct version:

    X*(323* ph level(3432-) (salinity of ph) = PIITB˛
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  10. #10
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    How does the word "unboiled" have any relevence to the question?
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    Originally Posted by Big Slim DaDDy
    Why is the sky blue?
    Rayleigh Scattering. Among other things.
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    Originally Posted by Diab0lic
    My first guess would be atmospheric CO2 dissolving into the water and creating HCO3-, CO3-, etc. These would make it acidic. Boiling the water would possibly reverse the process and keep it that way as long as the water container was sealed.
    This is exactly correct...

    Atmospheric CO2 would disolve in the water in small amounts, and thus form carbonic acid, shifting the pH slightly lower than 7.

    As for the boiling... The capacity of gasses to disolve in water is largely influenced by temperature, i.e. the higher the temp, the harder it is for gasses to disolve in water. Thats why when you drink a warm softdrink it is very bubbly and fizzy.

    Hence, it is was boiling, we would not expect to see much CO2 disolving, and as a result the pH would shift closer to 7.
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    pH of pure water is 7 at room temperature...25 degree celsius..

    pH is dependent upon temperature...


    pH = -Log[H+]

    H20 <=> (H+) + (OH-)



    the forward reaction is endothermic
    increasing the temperature favours the forward reaction
    [H+] and [OH-] increase...
    both pH and pKw thus increase.


    opposite happens upon decreasing the temperature.
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