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  1. steve todd

    steve todd Member

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    after using. Rotala calculator

    I. Mixed 600ml water to 330 gm of kno3
    It doesn’t all disolve
     
  2. Allwissend

    Allwissend Article Editor
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    Please consult chemistry websites or Wikipedia for maximum solubility of compounds. Also be aware that the solubility of one compound will be influenced by the other compounds added to the water, pH and temperature.

    The maximum solubility for KNO3 is 316g/L at room temperature, so you will need to double/triple your total volume to be able to dissolve all the salt.

    Hope this helps.
     
  3. steve todd

    steve todd Member

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    Thanks I made new solution for lowlightweekly
    200ml to 55 g. Kn03 Dosing 40ml weekly,will give me 10ppm of n03
    This will last 5 weeks

    Cheers
     
    #3 steve todd, Apr 9, 2018
    Last edited: Apr 9, 2018
  4. Julia Adkins

    Julia Adkins aquariumfertilizer.com
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    Solubility depends in part on the form that your potassium nitrate comes in. Some is intended for being mixed in soil and is less soluble than others. You need a specifically water soluble form. Any solute has a saturation level and usually will only reach partial saturation unless the temperature of the water is increased.
     
  5. Allwissend

    Allwissend Article Editor
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    Hi @Julia Adkins, what do you mean by forms of KNO3 ? Which ones would be more soluble ? Do you refer to purity of the salt or other sources of N ?

    To my knowledge, potassium nitrate is KNO3 as described here:
    https://pubchem.ncbi.nlm.nih.gov/compound/potassium_nitrate#section=2D-Structure

    This is for the 670L aquarium ? This is correct. Just to double check, the total volume of the solution is 200mL or ? So you add enough water over the 55g KNO3 to get 200mL solution.
     
    #5 Allwissend, Apr 9, 2018
    Last edited: Apr 9, 2018
  6. steve todd

    steve todd Member

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    Yes for the 670l with anubais and discus. I used the Rotala calculator, lowlight weekly make a solution using 200ml and dosing 40ml weekly it said to use 55g KNO3,I then made 200ml solutions of p04,amgrow trace mix both dosing 40ml weekly
    I

    cheers
     
    Allwissend likes this.
  7. Julia Adkins

    Julia Adkins aquariumfertilizer.com
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    Allwissend, by form I mean whether it comes in a grade like flour or like granulated sugar. The chemical compound is the same, KNO3. The flour like product is not very "drop in water soluble". It works better when mixed in soil. Of course, it is the water that falls on the ground that allows it to become available to the plant roots. But it does not work well to make a solution or to use dry to dose a tank.
     
  8. Allwissend

    Allwissend Article Editor
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    Hi, that clarifies it.

    With the very fine grade powders, it helps if you avoid the formation of "clumps". Mix well immediately after adding to the bottle of add at the filter outflow if dry dosing. Even when clumps get formed, if the solution is not saturated, KNO3 is easily dissolved in warmer water. Nothing like K2SO4 or CaSO4*2H2O, whatever grade ;)
     
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