Check my math - DIY KCl dosing

[trevorhiller]

I want to dose some Potassium Chloride. I ordered 227 grams from LoudWolf and mixed 150 grams of it into 850 mL water for a stock solution concentration of 78.67 grams of K in 850 mL for 92.55 mg K / mL

Formula weights I used were:
KCl- 74.548 (100%)
K- 39.098 (52.44%)
Cl- 35.45 (47.55%)

I used the dilution calculator here:

Dilution Calculator - Mass per Volume - PhysiologyWeb

Dilution Calculator - Mass per Volume (Mass / Volume)

www.physiologyweb.com

So about 25 mL should raise the volume of my 63 gallon / 238 Liter aquarium by 10 ppm. Does this look correct?

I'm trying to reteach myself high school chemistry, so if you have any tips or corrections I'm all ears!

 

[Bot587]

You’re good, just account for LR

 

[trevorhiller]

You’re good, just account for LR

Thank you! And thank you for posting your math, it helps me learn to do this manually.

I actually weighed my water on setup of my tank, so I think I am probably +/- 2-3 gallons accuracy on my volume.

 

[t5Nitro]

Did that dissolve well for you? I put 113.5 grams KCl powder into 500 mL of RODI by weight and it looks supersaturated.

Just to bump an old thread others might find useful in forum searches. I might just dilute it into a total 1 liter and double my daily dose.

 

[Randy Holmes-Farley Verified Community Expert]

My first use of my new diy archive. lol

I show how to use a calculator for K from KCl here:

Post your DIY additives here!

Is that the same as "Sodium tetraborate decahydrate"? yes. Decahydrate means 10 water molecules.

www.reef2reef.com

 

[Randy Holmes-Farley Verified Community Expert]

Did that dissolve well for you? I put 113.5 grams KCl powder into 500 mL of RODI by weight and it looks supersaturated.

Just to bump an old thread others might find useful in forum searches. I might just dilute it into a total 1 liter and double my daily dose.

Wikipedia gives these solubilities:
27.77 g/100mL (0 °C)
33.97 g/100mL (20 °C)
54.02 g/100mL (100 °C)

so your recipe should dissolve. Try warming it

 

[biom]

Did that dissolve well for you? I put 113.5 grams KCl powder into 500 mL of RODI by weight and it looks supersaturated.

Just be aware when dissolving bigger amounts - there is a chance final volume of the solution to be more than 500 ml and to have less mg per ml than calculated.

 

[trevorhiller]

Did that dissolve well for you? I put 113.5 grams KCl powder into 500 mL of RODI by weight and it looks supersaturated.

Just to bump an old thread others might find useful in forum searches. I might just dilute it into a total 1 liter and double my daily dose

Yes that dissolved ok for me, it took a lot of mixing though. I wouldn't make it more concentrated because I think you'd have to heat it to keep it in in solution. Even with mine there are occcassionally particles settled on the bottom of the bottle and I have to shake before dosing it.