How long will potassium nitrate solution keep?

nim6us

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Using RO water and potassium nitrate I've created a solution with help from James' Planted Tank calculator. I've made 100ml of solution for a 40L frag tank, so this should last me quite a while.

My question is how long will it keep for? My concern is that it settles out at the bottom, or loses potency. Is that a genuine issue, or will it be fine for years if I keep it in a cool dark place and just give it a good shake before using?
 
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lapin

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I would think shaking it should solve any setting issues.
100ml = 3 oz
This amount would not last very long for a frag tank
 
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nim6us

nim6us

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Thanks Lapin! Yeah the solution I made works out to 1ml to raise 1ppm of nitrate. As the tank does get some nitrate from feeding the corals I don't have to dose that much. I don't think it will last years, but it should be quite some time. :p

Screen Shot 2021-06-17 at 8.41.08 PM.png
 

Randy Holmes-Farley

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There will be no settling of potassium or nitrate unless you tried to make it super concentrated.

The solubility is 383 grams per L at 25 deg C, and dissolved ions do not settle, ever. :)
 
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nim6us

nim6us

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Oh @Randy Holmes-Farley you're a treasure sir! I'm an IT engineer and when you reply to my posts I imagine this is what my users must feel like.

You're surrounded by a sea of people who have no real idea what you do and you answer the same basic questions over and over every day. I appreciate your service. ;)
 
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Rob.bucek

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Oh @Randy Holmes-Farley you're a treasure sir! I'm an IT engineer and when you reply to my posts I imagine this is what my users must feel like.

You're surrounded by a sea of people who have no real idea what you do and you answer the same basic questions over and over every day. I appreciate your service. ;)
Preach!
 

brandon429

why did you put a reef in that
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One of the reasons Borat 1 is the funniest movie ever made was when he accused all other countries of having inferior potassium I think that line made me laugh the hardest out of them all. wishing you quality potassium lol
 
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