Predict the most likely color at the endpoint when thymol blue is used as an Indicator during an acid base neutralization titration
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Tom C.
Thymol blue in its acid range is not a suitable indicator for the titration of HCl by NaOH. Suppose that a student uses thymol blue by mistake in the titration of Figure $17-8$ and that the indicator end point is taken to be $\mathrm{pH}=2.0$ (a) Would there be a sharp color change, produced by the addition of a single drop of $\mathrm{NaOH}(\mathrm{aq}) ?$ (b) Approximately what percent of the HCl remains unneutralized at $\mathrm{pH}=2.0 ?$
For the following titrations, select which of the two indicators given is more appropriate. (Section 7.5 ) (a) Propanoic acid titrated against sodium hydroxide solution using either phenolphthalein (pK $_{\text {in }} 9.4$ ) or methyl orange $\left(p K_{i n} 3.4\right)$ (b) Hydrochloric acid titrated against methylamine solution using either thymol blue $\left(\mathrm{pK}_{\mathrm{n}}, 9.0\right)$ or bromophenol blue $\left(p K_{i n} 3.9\right)$
Jiva Y.
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