Which is the best colored indicator to use in the titration?
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Which is the best colored indicator to use in the titration of 0.005 M HClO(aq) with NaOH(aq)? Why? (Ka of HClO = 3.5 x 10^–8, Kb of ClO– = 2.9 x 10^–7) Indicator pKa Thymol Blue 2.0 Phenol Red 7.5 Phenolphthalein 9.2 1. Phenol Red. The pKa of HClO and the pKa of the indicator are similar. 2. Phenolphthalein. The pKa of ClO– and the pKb of the indicator are similar. 3. Thymol Blue. The equivalence point for a weak acid titration occurs at low pH. 4. Phenolphthalein. The pH at the equivalence point is near the pKa of the indicator. 5. Phenol Red. The pH at the equivalence point is 7.0.
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Answer:
Phenolphthalein. The pKa of ClO– and the pKb of the indicator are similar and the pH at the equivalence point is near the pKa of the indicator.
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Phenolphthalein. The pKa of ClO– and the pKb of the indicator are similar and the pH at the equivalence point is near the pKa of the indicator.
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