PH to ppm with ammonia chart/problem

  • Thread starter Moynihan36
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  • #1
I need some help calculating basic chemistry. I need to know how much ammonia I need to add to a volume of water to reach the appropriate pH level.

I have 50 cubic meters of demin water that I need to raise to a pH of 11. Volume is not flowing.
I am using aqueous ammonia of 25% solution. I was able to find online that a pH of 11 is equal to 50 mg/L (not 100% sure).

This a two part question:
How do I calculate the concentration of the solution based on the pH?
How do I calculate the required volume to dose the 50 cubic meters to reach the pH of 11?

Also, does anyone have a pH vs mg/L (ppm) in a quick reference chart?

After some research I found some answers and it calculated (roughly) that I need 15 liters.

Thanks,
 

Answers and Replies

  • #2
Borek
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Even if I believe you, giving a correct answer would be against forum rules.

Start here:

http://www.chembuddy.com/?left=pH-calculation&right=pH-weak-acid-base

While this is about calculating pH for known concentration, information there should help you calculate concentration for a given pH. pKb for ammonia is 4.75

Your ppms are terribly off, surprisingly, your volume is at least in the correct ballpark.

I shouldn't write it - but you can find answer pretty fast using my calculators, BATE & CASC.
 
  • #3
Borek
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One additional note: if it is about demineralized water used in the industrial settings, final pH will be different than just calculated from the ammonia concentration, as solution will absorb atmospheric carbon dioxide - that will lower the pH.
 

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