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I have a bottle of sodium nitrate powder, I am not too sure how to get it to a gravity=1.20 solution. If I use 100ml of water and weigh it, it'll be 100g; do I just add the powder in until the scale reads 120g? Is this right?
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You want the specific gravity to be 1.2? You need to use a hydrometer (i think this is the correct term) like for saltwater fish tanks. I would use molarity to represent concentration......