if we are having water with pH = 11.5 , this water containing calcium, Magnesium, silicate chloride , sodium, Sulphate and other elements. How can I measure or calculate NaOH concentration in water sample
Federico Svarc
Just with a simple potentiometry titrating with HCl standard solution
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But that will give the total Alkalinity or total OH. I am only looking for NaOH
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Federico Svarc
You will visualise different slopes when you perform the potentiometry.
The stipest should belong to NaOH. I am assuming it is the predominant species.
Calcium and Magnesium maybe could interfere. You could try a complexation with EDTA first.
If you have it available, with Atomic Absorption spectrometry you could quantify the quantities of the different cations present.
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