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Thread: Category: Marine Aquaristics

  1. #1
    Join Date
    Dec 2007
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    Lusby, Maryland
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    Default Category: Marine Aquaristics

    If you add carbon dioxide to seawater the pH

    a. quickly rises.

    b. quickly drops.

    c. usually stays the same and then rises.

    d. usually stays the same and then drops.




    All questions and answers are from The Marine Aquarists' Quiz Book by Martin and Barbara Moe.
    Lynne

  2. #2
    Join Date
    Jul 2012
    Location
    St Leonard
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    284

    Default

    ...c?
    Ken Higgins
    120 gallon reef
    50 gallon fresh water

  3. #3
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    Dec 2007
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    Lusby, Maryland
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    d) When CO2 is added to seawater it reacts with hydrogen and forms carbonic acid, which could cause the pH to drop. Carbonic acid, however, then immediately forms carbonate and bicarbonate, which in turn join with calcium and form calcium carbonate. This "uses up" the carbonic acid and the pH remains stable. This reaction can move both ways, depending on availability of CO2 and calcium, and this maintains seawater pH at about 8.2. This is the seawater buffer system. If more CO2 is added, and additional calcium is not available, then carbonic acid increases and pH drops, thus at first the pH stays the same and then if excess CO2 accumulates, or if calcium is depleted, it then drops.
    Lynne

  4. #4
    Join Date
    Dec 2007
    Location
    Lusby, Maryland
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    The answer to this weeks trivia question pretty much explains how a calcium reactor works. The calcium reactor container is filled with media and saltwater. The media is made from coral rock fragments. When the CO2 is added to the calcium reactor container, an acidic solution is formed. This solution dissolves the coral rock fragments. Below is a quick video that goes into better detail on calcium reactors.

    https://www.youtube.com/watch?v=mb5QLuirxI0

    Is anyone running a calcium reactor? This is one of the items on my wish list! Maybe I will get lucky and win one at MACNA this year!
    Lynne

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