How can I be sure regarding the endpoint of Na2CO3 vs HCl titration?

10 May 2014 1 626 Report

0.1 N concentration solution of both was taken, with HCl as titrant abd HPh as indicator. After reaching the endpoint of colourless condition, the colour reappears after continous shaking for 5 mins. even sometimes after 15 mins. How to be sure of that this much time is enough, for shaking to confirm completion of titration?

SILAS DERENZO

titration of carbonates and bicarbonates is an intricate problem. carbon dioxide from the atmosphere can interfere with the titration. I suggest soaking the tip of the burette the solution.

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