Help me create a stock solution for NaNO3

[Kairus]

I got some sodium nitrate and I want to make a stock solution out of it. I've made one for KNO3 but would prefer to use sodium nitrate since I can't test for potassium and, well... I bought some sodium nitrate. I used an aquarium fertilizer calculator for the KNO3, but it doesn't do NaNO3 and since the amount of NO3 is different in each solution, I would be off if I used that calculator.

250mL or 500mL container, tank is a 72 bow, probably about 62g once you factor in all my rock and sand. I'd like to raise my tank by small amounts; 1-2ppm. I need to know how many grams of NaNO3 to dilute, and how many mL I would have to put into the tank to raise my NO3 by 1 or 2 ppm.

Thanks!

 

[bertoni]

1 ppm is about 1 mg/dL, so you need roughly 4g of nitrate per gallon for 1 ppm.

What do you have in the way of a scale, or are you going by volume? If you're not needing a huge amount of accurate, the KNO₃ entry should be close. You could use about 15% less by weight, or just call it close enough as is.

 

[Jimmy54]

Calculating with rounded numbers the molecular mass of NaNO3 is 85 g/mol.
The molecular mass of sodium is 23 g/mol which leaves 62 g/mol for NO3.

For raising 1 mg/l NO3 in 62 gallon you need to dissolve 10 grams of NaNO3 into 250 ml and dose 8 ml.
20 grams for 4 ml - 40 grams for 2 ml and 80 grams to dose 1 ml.

Dissolving the same amount into 500 ml gives you twice the amount to dose
Dissolving twice as much into 500 ml gives you the same amount to dose.

Hope it makes sense a bit