01-23-2010, 02:03 AM
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Originally Posted by Byron
The acid regeant in a nitrate test apparently works better, not sure but I think it is Regeant #2--it's the one that is an acid anyway.
Bottle #1 is 41% hydrochloric acid. This is a much stronger acid than vinegar and is double the concentration of the "other" commonly available strong acid, muriatic acid (which is actually just a 20% HCl solution). The ultimate "is ____ made of calcium?" test.
I agree, though. Seashells are almost entirely calciferous material and will most certainly raise your pH and hardness.