[Glag07]

Hello all,

How do I get from alkalinity expressed as mg/l of CaCO3 to total alkalinity expressed as mg/l of HCO3 (assuming pH<8.3).

Alkalinity as CaCO3 is being calculated by:
(ml titrant * normality of acid * 50,000) / (ml of sample)

Thanks for any help

[Mr Peanut]

Well, we can go back to the original equation Glag:

(ml titrant  * normality * equiv weight) / ml sample

only this time we will enter 61000 mg instead of 50000 mg as it is the eq wt of HCO3.

We can do this because at your pH, all of your alkalinity is bicarbonate alkalinity (ie there is carbonate alkalinity)

[Mr Peanut]

correction I ment to say there is no carbonate alkalinity