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Re: Alkalinity/carbonate hardness

	Whatever it says in the reefkeepers' FAQ, sulphate, being the 
anion of a strong acid, will not contribute to alkalinity.  The second
pKa of sulphuric acid is about 2, and the titration used to measure
alkalinity usually ends at the methyl orange endpoint, which is well
above that.  If you want, you can use sulphuric acid to perform
the titration to _measure_ alklinity.

Paul Sears        Ottawa, Canada