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Why is there a need to use two indicators in titrating a carbonate mixture?
Wiki User
∙ 12y ago
One single probe may contain two bases: Either OH- and CO32-, or CO32- and HCO3- . (All three of them is non-coexsistant, hence it is impossible)
- Titration with strong acid will reach the first equivalence point at pH = 8 (phenolphtaleine change to colorless) when both, or one, of these completed reactions:
OH- + H+ --> H2O (if OH- is present) and
CO32- + H+ --> HCO3-
- Further titration with strong acid, after addition of methyl orange indicator will reach the second equivalence point at pH = 4 (methyl orange changes from orange-yellow to red) when this reaction is completed :
HCO3- + H+ --> H2CO3
From the difference and total of these two titrtions (done with the same probe in two steps) both compounds can be determined.
Wiki User
∙ 12y ago
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