Help With Concenetrations

xoedusk

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Hello all.

I am having a bit of trouble. Nearly every fish/aquatic plant site I've been to, including http://www.csd.net/~cgadd/aqua/art_plant_dosage_calc.htm says the density of KNO3 (potassium nitrate) is 5.6 g / tsp.

Sites such as Wikipedia and government haz mat sites list the density of KNO3 as 2.1 g / cm^3. Now there are about 4.9 cm^3 in a tsp. This means that the density of KNO3 would be about 10 g / tsp.

What's going on?
 

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