Randy Holmes-Farley
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Reef Chemistry Question of the Day #77
Being the brilliant reef scientist that you are, everything seems to be at appropriate levels in your reef tank, but some of the creatures are just not looking as good as they did at the same time last year.
Finally you discover that your refractometer must be broken and is way off. The salinity is much too low.
You decide to top off for evaporation with new saltwater (Instant Ocean made to 35 ppt) in order to slowly bring up the salinity.
Normally you top off with saturated limewater (kalkwasser). Since you won't be topping off with limewater during this period, both calcium and alkalinity in the tank might be impacted. But in what way?
Which of the following is the most accurate statement?
A. The limewater has more than 5 times as much calcium as the seawater you are now topping off with.
B. The limewater has about twice as much calcium as the seawater you are now topping off with.
C. The limewater has about the same calcium as the seawater you are now topping off with.
D. The limewater has about half as much calcium as the seawater you are now topping off with.
E. The limewater has less than 1/5 as much calcium as the seawater you are now topping off with.
Good luck!
.
Being the brilliant reef scientist that you are, everything seems to be at appropriate levels in your reef tank, but some of the creatures are just not looking as good as they did at the same time last year.
Finally you discover that your refractometer must be broken and is way off. The salinity is much too low.
You decide to top off for evaporation with new saltwater (Instant Ocean made to 35 ppt) in order to slowly bring up the salinity.
Normally you top off with saturated limewater (kalkwasser). Since you won't be topping off with limewater during this period, both calcium and alkalinity in the tank might be impacted. But in what way?
Which of the following is the most accurate statement?
A. The limewater has more than 5 times as much calcium as the seawater you are now topping off with.
B. The limewater has about twice as much calcium as the seawater you are now topping off with.
C. The limewater has about the same calcium as the seawater you are now topping off with.
D. The limewater has about half as much calcium as the seawater you are now topping off with.
E. The limewater has less than 1/5 as much calcium as the seawater you are now topping off with.
Good luck!
.
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