17.3c pH Titration Plots as an Indicator of Acid or Base Strength 20 mL of 0.1M titrand titrated with 0.1M titrant. Data points at 1 mL increments. (a) Is the species being titrated an acid or a base? (b) Is the species being titrated strong or weak? (c) What is the value of Ka (if a weak acid) or Kb (if a weak base) for the species being titrated? If the species is strong (100% dissociated), enter 999.
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The following pH curve is for the titration of 20.0 mL of a 0.10 M solution of a weak monoprotic base with a 0.10 M solution of a strong monoprotic acid. Data points at 1 mL increments. 12.0 10.0 8.0 6.0 4.0 2.0 0.0 0.0 10.0 20.0 30.0 40.0 50.0 Volume of titrant (mL) (a) What is the pH before any titrant has been added? (b) What is the pH at the midpoint of the titration? (c) What is the pH at the equivalence point? (d) What is the value of Kb for the weak base?
David C.
Sketch a titration curve (pH versus mL of titrant) for each of the following hypothetical weak bases when titrated with 0.100 M HCl. (Think of these bases as involving the substitution of organic groups, $R$, for one of the $\mathrm{H}$ atoms of $\mathrm{NH}_{3}$.) Select suitable indicators for the titrations from Figure $17-7 .$ [Hint: Select a few key points at which to estimate the $\mathrm{pH}$ of the solution.] (a) $10.00 \mathrm{mL}$ of $0.100 \mathrm{M} \mathrm{RNH}_{2} ; K_{\mathrm{b}}=1 \times 10^{-3}$ (b) $10.00 \mathrm{mL}$ of $0.100 \mathrm{M} \mathrm{R}^{\prime} \mathrm{NH}_{2} ; \overline{K_{\mathrm{b}}}=3 \times 10^{-6}$ (c) $10.00 \mathrm{mL}$ of $0.100 \mathrm{M} \mathrm{R}^{\prime \prime} \mathrm{NH}_{2} ; K_{\mathrm{b}}=7 \times 10^{-8}$
You are given the following acid-base titration data, where each point on the graph represents the $\mathrm{pH}$ after adding a given volume of titrant (the substance being added during the titration). a. What substance is being titrated, a strong acid, strong base, weak acid, or weak base? b. What is the $\mathrm{pH}$ at the equivalence point of the tiration? c. What indicator might you use to perform this titration? Explain.
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