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Author: Subject: Silver nitrate chloride titration
phillyza
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[*] posted on 26-3-2014 at 05:20
Silver nitrate chloride titration


Hi, Im new to the forum and dont know if this is the correct place to post.

Im doing NaCl electrolysis. Im starting out with approximately 1g/l salt solution which gives me 585 ppm chlorides when measured with the mohr silver titration method.

Then activation takes places and Im producing Anolyte and Catholyte. Then I measure the Free Available Chlorine and the Chlorides in the Anolyte and I get about 330ppm FAC and the residual chlorides is about 496 ppm with the Mohr titration.

This doesnt makes sense to me because I expected that starting chlorides - FAC = end chlorides, which is not the case. I expected that some of the chlorides convert in chlorine components (FAC) and you just subtract the FAC from the starting chlorides to obtain end chlorides? In this example I expected end chloride value in my Anolyte to be 255ppm (585 - 330). Any guidance on this?

Where have I got it wrong? Does the silver nitrate titration measures total Cl - meaning chlorides or chlorine components?
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