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Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: mufan on June 12, 2015, 12:30:35 PM

Title: conversion of total alkalinity to pH
Post by: mufan on June 12, 2015, 12:30:35 PM

Hi,
I know that pOH is neg log of OH concentration.  But I've always done this using molarity.  how do you do this if you have total alkalinity?  for instance, if the total alkalinity of a solution is 400 ppm...what is the calculated pH?

thanks!

Title: Re: conversion of total alkalinity to pH
Post by: Borek on June 12, 2015, 01:56:51 PM

Total alkalinity is not directly related to pOH.

Title: Re: conversion of total alkalinity to pH
Post by: mufan on June 15, 2015, 12:31:05 PM

I agree.  you have carbonate alkalinity in there as well.  So is it something that you can figure out by taking a p alkalinity or 2p-m for an OH alkalinity?  or the addition of several alkalinity concentrations?