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Chemistry Help.

Hi all,

I am trying to figure out how much KNO3 to add to my tank so I can get about
5ppm of NO3 but  chemistry is not that great.  I gonna write what I got so
far, and if you all can tell me if I'm on the right track.

3 tablespoon KNO3 ~ 36.6g
200 ml water

Concentration of KNO3 in 200ml water - 36600 / 0.2 = 180000ppm

NO3 is 61% off KNO3.. so

180000 / 0.61 = 109800ppm of NO3 ....... right?

so if I take 1ml off this solution and add it to my 100 liter tank,  What
will I get?

I can't seem to wrap my mind around the math on this one.

is this close?

(109800/1000) / 100l = 1.098 ppm

Steve (whos head is big as a pumpkin right now)