🤓 Based on our data, we think this question is relevant for Professor Zaitsev's class at UH.

$\left[\mathrm{KHP}\right]\mathbf{=}\frac{\mathbf{0}\mathbf{.}\mathbf{5}\mathbf{}\overline{)\mathbf{g}\mathbf{}\mathbf{KHP}}\left({\displaystyle \frac{1\mathrm{mol}\mathrm{KHP}}{204.22\overline{)g\mathrm{KHP}}}}\right)}{\mathbf{100}\mathbf{}\overline{)\mathbf{mL}}\left({\displaystyle \frac{{10}^{-3}L}{1\overline{)\mathrm{mL}}}}\right)}\mathbf{=}$**0.0245 M**

${\mathbf{K}}_{\mathbf{a}}\mathbf{=}{\mathbf{10}}^{\mathbf{-}{\mathbf{pK}}_{\mathbf{a}}}\mathbf{=}{\mathbf{10}}^{\mathbf{-}\mathbf{5}\mathbf{.}\mathbf{51}}\mathbf{=}$**3.09×10**^{-6}

${\mathbf{K}}_{\mathbf{b}}\mathbf{=}\frac{{\mathbf{K}}_{\mathbf{w}}}{{\mathbf{K}}_{\mathbf{a}}}\mathbf{=}\frac{\mathbf{1}\mathbf{\times}{\mathbf{10}}^{\mathbf{-}\mathbf{14}}}{\mathbf{3}\mathbf{.}\mathbf{09}\mathbf{\times}{\mathbf{10}}^{\mathbf{-}\mathbf{6}}}\mathbf{=}$**3.24×10 ^{-9}**

Reaction: HP^{- }_{(aq)} + OH^{-}_{(aq)} → H_{2}O_{(l)} + P^{2-}_{(aq)}

Construct an ICE Chart:

$\overline{){{\mathbf{K}}}_{{\mathbf{b}}}{\mathbf{=}}\frac{\mathbf{products}}{\mathbf{reactants}}{\mathbf{=}}\frac{\left[{\mathrm{HP}}^{-}\right]\left[{\mathrm{OH}}^{-}\right]}{\left[{P}^{2-}\right]}}$

Potassium hydrogen phthalate, known as KHP (molar mass = 204.22 g/mol), can be obtained in high purity and is used to determine the concentration of solutions of strong bases by the reaction

HP^{- }_{(aq)} + OH^{-}_{(aq)} → H_{2}O_{(l)} + P^{2-}_{(aq)}

If a typical titration experiment begins with approximately 0.5 g KHP and has a final volume of about 100 mL, what is an appropriate indicator to use? The pK_{a} for HP ^{-} is 5.51.

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Our tutors have indicated that to solve this problem you will need to apply the Acid Base Indicators concept. If you need more Acid Base Indicators practice, you can also practice Acid Base Indicators practice problems.

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Based on our data, we think this problem is relevant for Professor Zaitsev's class at UH.

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Our data indicates that this problem or a close variation was asked in Chemistry: An Atoms First Approach - Zumdahl 2nd Edition. You can also practice Chemistry: An Atoms First Approach - Zumdahl 2nd Edition practice problems.