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Perform a acid-base titration with a strong acid with a known concentration. Don't forget to measure the exact mass or the molarity of KOH/K2CO3.

Repeat this determination several times to find the right equivalence point, this is important by these kind of quality controls. Then you can calculate the molar ratio of KOH/K2CO3.

(V*C)acid = (V*C)base C= concentration and V = volume

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