Randy Holmes-Farley
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Reef Chemistry Question of the Day #63 Gas Exchange 4
It is Superbowl Sunday, and you have a big crowd over to watch the game. It is really cold out and the the house is closed up tight.
It is a very exciting finish and everyone is standing and shouting and milling about.
Being the reef geek that you are, you have two reef aquariums in your living room, in addition to the big screen TV with the game on.
The aquariums are identical in every way, except that one sits on the floor (waiting for a new stand) and the other is up near the ceiling (I can't imagine why you did that, but you did).
Just after the last seconds of the game clock tick down, you remember hearing that big crowds can produce a lot of CO2 and that CO2 can lower tank pH. You rush to the tanks and check the pH that has been logged for each tank since just before game time when no one was around.
What do you see?
A. The pH started the same and then declined by exactly the same amount in the two tanks.
B. The pH started the same and then declined in both, but the one on the floor declined more.
C. The pH started the same and then declined in both, but the one on the floor declined less.
D. The pH started higher in the tank on the floor and then the pH declined by exactly the same amount in the two tanks.
E. The pH started lower in the tank on the floor and then the pH declined in both, but the one on the floor declined more.
F. The pH started higher in the tank on the floor and then the pH declined in both, but the one on the floor declined less.
G. The pH rose in at least one of the tanks.
Assume no supplements have been added during the pH measurement period, and that contributions to pH changes from photosynthesis and respiration in the reef tanks are insignificant during this time period relative to the effects of the CO2 from the people.
Good luck!
.
It is Superbowl Sunday, and you have a big crowd over to watch the game. It is really cold out and the the house is closed up tight.
It is a very exciting finish and everyone is standing and shouting and milling about.
Being the reef geek that you are, you have two reef aquariums in your living room, in addition to the big screen TV with the game on.
The aquariums are identical in every way, except that one sits on the floor (waiting for a new stand) and the other is up near the ceiling (I can't imagine why you did that, but you did).
Just after the last seconds of the game clock tick down, you remember hearing that big crowds can produce a lot of CO2 and that CO2 can lower tank pH. You rush to the tanks and check the pH that has been logged for each tank since just before game time when no one was around.
What do you see?
A. The pH started the same and then declined by exactly the same amount in the two tanks.
B. The pH started the same and then declined in both, but the one on the floor declined more.
C. The pH started the same and then declined in both, but the one on the floor declined less.
D. The pH started higher in the tank on the floor and then the pH declined by exactly the same amount in the two tanks.
E. The pH started lower in the tank on the floor and then the pH declined in both, but the one on the floor declined more.
F. The pH started higher in the tank on the floor and then the pH declined in both, but the one on the floor declined less.
G. The pH rose in at least one of the tanks.
Assume no supplements have been added during the pH measurement period, and that contributions to pH changes from photosynthesis and respiration in the reef tanks are insignificant during this time period relative to the effects of the CO2 from the people.
Good luck!
.