Choosing an indicator for a titration

Select a suitable indicator from the data booklet whose pH range matches the equivalence point pH predicted from the salt formed, and distinguish the end point (indicator colour change) from the equivalence point (stoichiometric completion).

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What is the best indicator to use in the titration of propanoic acid with potassium hydroxide? A. Methyl orange, $\mathrm{p}K_\mathrm{a} = 3.7$ B. Bromocresol green, $\mathrm{p}K_\mathrm{a} = 4.7$ C. Bromothymol blue, $\mathrm{p}K_\mathrm{a} = 7.0$ D.…

The pH curve below was obtained when sodium hydroxide solution was added to a sample of ethanoic acid until the base was in excess. Which indicator would be most suitable for this titration? A. Methyl red, p $K_\mathrm{a}$ = 5.1 B. Phenolphthalein,…

The student then used the potassium hydroxide solution standardized in 1c to titrate ethanoic acid, $\ce{CH3COOH}$ , whose concentration was not known. (i) Neutralizing 25.00 $\mathrm{cm^3}$ of the acid required 40.00 $\mathrm{cm^3}$ of the standardized…

Hexanoic acid, $\ce{CH3(CH2)4COOH}$ , is a weak acid. The graph shows how the pH changes during the titration of a 20.0 $\mathrm{cm^3}$ aqueous solution of hexanoic acid with aqueous sodium hydroxide. (i) Deduce an expression for the equilibrium constant, $K$ ,…

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