Check my reef chemistry

[fushi]

Hi, I wanted to have an excel sheet with my most used calculators on it. I reveresed engineered the formulas for Alk, Calcium, and magnesium from BRS so if there a a more proper formula please let me know.
For the TriSodium Phosphate and Sodium Chloride formulas I referenced @Randy Holmes-Farley posts on R2R, so hopefully I understood those correctly.

I wrote out the formulas in red on the right and worte the solution recipes above them in black.
How did I do and what would you fix?

I don't think the Alk recipe is perfect for randys solution but it is close enough to do the job. If someone could help my adjust the recipes to better match that would be great. I like haveing my alk recipes 1:1 so I can vary their dose based on my PH needs.

If anyone know the how to upload an excel file to R2R please let me know.

 

[redfishbluefish]

#reefsqaud , any thoughts or input?

 

[Randy Holmes-Farley Verified Community Expert]

For checking the calculations, you can use these calculators:

BRS soda ash recipe is my DIY Recipe #1 in the first calculator

Reef Chemistry Calculator

James' Planted Tank - Dosing Calculator

 

[fushi]

For checking the calculations, you can use these calculators:

BRS soda ash recipe is my DIY Recipe #1 in the first calculator

Reef Chemistry Calculator

James' Planted Tank - Dosing Calculator

I also used those calculators for reference but found the BRS calculator showed more decimial places.

I thought sodium nitrate and trisodium phosphate contained slightly different ammounts of NO3 and Po4 than potassium nitrate and potassium phosphate listed on the planted tank calculator.

Sodium nitrate = 74% NO3 NO3 63.013 mol / NaNO3 84.995 mol ?
Trisodium Phosphate = 58% PO4 PO4 94.971 mol / Na3PO4 163.941 mol ?
Is this correct?
Its been a very long time since my last chemistry class.


I was also hoping you could help me understand how to calculate the dkh.
Your recipe says 283g of sodium hydroxide in 1 gallon contains about 1,900 meq/L alk. or (5,300 dKH); so would it be accurate to say 1 gram of sodium hydroxide contains 18.73 dkh (5300dkh/283g)?

 

[Randy Holmes-Farley Verified Community Expert]

I also used those calculators for reference but found the BRS calculator showed more decimial places.

I thought sodium nitrate and trisodium phosphate contained slightly different ammounts of NO3 and Po4 than potassium nitrate and potassium phosphate listed on the planted tank calculator.

Sodium nitrate = 74% NO3 NO3 63.013 mol / NaNO3 84.995 mol ?
Trisodium Phosphate = 58% PO4 PO4 94.971 mol / Na3PO4 163.941 mol ?
Is this correct?
Its been a very long time since my last chemistry class.


I was also hoping you could help me understand how to calculate the dkh.
Your recipe says 283g of sodium hydroxide in 1 gallon contains about 1,900 meq/L alk. or (5,300 dKH); so would it be accurate to say 1 gram of sodium hydroxide contains 18.73 dkh (5300dkh/283g)?

You can get more decimal places by increasing the tank volume (say, 10 or 100 x), and then jsut move the decimal. I do that a lot for folks who are making very small doses.

Yes, the James calculator is not going to give the exact answer for sodium versions. They also do not say exactly what form they are calculating for with respect to phosphate as there are several.

1 gram of sodium hydroxide (mw = 40) contains exactly 25 millimoles of hydroxide = mmoles of alkalinity.

Dissolved in 1 L, that gives 25 mM or 25 meq/L of alkalinity or 70 dKH.

dKh is not something 1 gram can contain. It depends on the volume it is put in since dKH is an alk per unit volume measure.

 

[fushi]

You can get more decimal places by increasing the tank volume (say, 10 or 100 x), and then jsut move the decimal. I do that a lot for folks who are making very small doses.

Yes, the James calculator is not going to give the exact answer for sodium versions. They also do not say exactly what form they are calculating for with respect to phosphate as there are several.

1 gram of sodium hydroxide (mw = 40) contains exactly 25 millimoles of hydroxide = mmoles of alkalinity.

Dissolved in 1 L, that gives 25 mM or 25 meq/L of alkalinity or 70 dKH.

dKh is not something 1 gram can contain. It depends on the volume it is put in since dKH is an alk per unit volume measure.

Ok after some busy weeks at work im back at it,

So
NaOH = 39.997 mol
Sodium = 22.9897693 mol (57.48%)
OH = 17.0072307 mol (42.52%)

I'm confused on how you get 25 millimoles of hydroxide?

 

[reefkeeper2]

For checking the calculations, you can use these calculators:

BRS soda ash recipe is my DIY Recipe #1 in the first calculator

Reef Chemistry Calculator

James' Planted Tank - Dosing Calculator

I was wondering why recipe #1 with sodium carbonate has twice the alkalinty that recipe #2 with sodium bicarbonate has. Does it have something to do with how much each can dissolve in a gallon of water?

 

[Randy Holmes-Farley Verified Community Expert]

I was wondering why recipe #1 with sodium carbonate has twice the alkalinty that recipe #2 with sodium bicarbonate has. Does it have something to do with how much each can dissolve in a gallon of water?

Exactly. Sodium bicarbonate is much less soluble in water.