# How Much 45% Phosphoric Acid is Needed to Raise PO4 by 1ppm in 1 Litre of Water?

• skyshrimp
skyshrimp
How much 45% phosphoric acid (in ml) would it take to raise PO4 by 1ppm in 1 litre of water?

I need to be sure as fish are involved. It will be administered over a 24 hour period.

Without a lot of thinking (maybe):

1 ppm of phosphoric acid (measured as a fluid in mls) in a liter would be 1/1000 mls.
45% phosphoric acid would require 1/45 x 1/1000 mls.
Figure out the fraction of the PO4 in the phosphoric acid by its molecular weight.
Multiply by that number to get your result.

Thanks,

I calculate that at about 7.2ml of 45% phosphoric acid to raise PO4 by 1ppm in 300 litres.

Add slowly or high local concentrations may cause problems before it is mixed throughout the whole volume.

skyshrimp said:
I calculate that at about 7.2ml of 45% phosphoric acid to raise PO4 by 1ppm in 300 litres
Are you sure seems high to me?

gleem said:
Are you sure seems high to me?
That's was my first thought, but
skyshrimp said:
in 300 litres.
so 300x of a liter's worth.

my method is conc1 x vol1 = conc2 x vol2

Let’s say you had it at 100% then 1ml would be enough for 1M ml =1000liters
Therefore at 45% 1 ml would be enough for 450 liters
You have 300 liters, so 2/3 of that.
Solution:
Get a cup of water add 1ml and mix
Drop 1/3 of a cup of the mix
You need .67 ml of it but that’s harder to calculate

Thanks,

I made a mistake with my rough calculation. I should have estimated 0.72ml, not 7.2ml. 0.67ml is more accurate. I was adding slowly and testing each day. I got to 1ppm quickly, so knew my math was off.

Last edited:
Also, there is 60mg of phosphoric acid in a can of Cola-Cola.

One drop of liquid is 0.05ml which is 50mg. My phosphoric acid is 45%, so I figure I can add 2 drops to a 330ml drink to safely give it some extra bite.

skyshrimp said:
I need to be sure as fish are involved.
skyshrimp said:
Also, there is 60mg of phosphoric acid in a can of Cola-Cola.

One drop of liquid is 0.05ml which is 50mg. My phosphoric acid is 45%, so I figure I can add 2 drops to a 330ml drink to safely give it some extra bite.
Wait, you've gone from a 300 liter fish tank to a can of soda? I'm getting dizzy...

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