DIY Potassium Nitrate Calculating - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 05-11-2015, 01:33 PM Thread Starter
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DIY Potassium Nitrate Calculating

Hi,

I bought potassium nitrate that produced for agriculture. (13.0.46) N:%13 P:%0 K:%46

The molar mass is this fertilizer here; http://www.convertunits.com/molarmass/KNO3

I added 100gr in 1000ml water. And I added 10ml from this solition to my 50lt aquarium. I calculated like this;

For potassium
10 ml water contain 0,3867 gr potassium
PPM = (50.000g/0,3867) x 1.000.000
PPM = (0,000007734) x 1.000.000
PPM = 7,73 (This is true.)

For Nitrate
10 ml water contain 0,1385 gr nitrate
PPM = (50.000g/0,1385) x 1.000.000
PPM = (0,00000277) x 1.000.000
PPM = 2,77 (This is false)


So, I added %13 N and %46 K. But, The James' Planted Tank web pages calculate differently . Dou you know anything for this difference?

Thank you very much.
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post #2 of 4 (permalink) Old 05-12-2015, 02:25 AM
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The mistake I see is using the mass of Nitrogen (N), rather than Nitrate (NO3).
The molar mass of Nitrogen is 14.0067, or 13.85% mass of KNO3.
The molar mass of Nitrate is 62.0049, or 61.33% mass of KNO3.

So when you use 61.33% instead of 13.85%, you get the correct 12.26ppm NO3 (which matches James).
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post #3 of 4 (permalink) Old 05-12-2015, 02:58 AM
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Hi

I think the Fertilator on APC might help you as well.

http://www.aquaticplantcentral.com/f...fertilator.php

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post #4 of 4 (permalink) Old 05-18-2015, 05:28 AM Thread Starter
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Thank you very much.
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