Zadania z chemii IB HL

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Each indicator contains more than one benzene ring. (i) State one functional group, other than the phenyl group, that is present in all three indicators. (ii) Deduce the colour of light absorbed by bromothymol blue in acidic conditions and by bromophenol blue…

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Cresolphthalein is a weak acid that can be represented as HIn. Using an equation, explain why the colour of a solution containing cresolphthalein depends on its pH.

An indicator, HIn, is a weak acid with $\mathrm{p}K_a = 5.0$ . HIn is yellow and its conjugate base, $\ce{In-}$ , is blue. $\ce{HIn(aq) <=> H+(aq) + In^-(aq)}$ Which statements are correct? I. At pH 2.0 the indicator appears yellow. II. At pH 5.0 the…