Chapter 11: Q72P (page 263)

Titrating triprotic acid with strong base.Prepare a spreadsheet to graph the titration of 50.0 mL of 0.020 0 M histidine^.2HCl with 0.100 M NaOH. Treat histidine^.2HCl with the triprotic acid equation in Table 11-5

Short Answer

Expert verified

The spreadsheet developed is shown below

The graph obtained from the above table is as follows

Step by step solution

Information given

Titration of 50.0 mL of 0.020 M histidine^.2HCl with 0.100 M NaOH.

Histidine.2HCl should be considered as a triprotic acid here and NaOH is a strong base. So, the reaction here will be in between triprotic acid with strong base.

Equation need to be used to develop spreadsheet

From table 11.5 the equation for the fraction of titration of triprotic acid with strong base is as follows

$ϕ = \frac{C_{b} V_{b}}{C_{a} V_{a}} = \frac{α_{H_{2} A^{-}} + 2 α_{H A^{2 -}} + 3 α_{A^{3 -}} - \frac{[H^{+}] - [O H^{-}]}{C_{a}}}{1 + \frac{[H^{+}] - [O H^{-}]}{C_{b}}}$

Other formulas need to be used

$\begin{array}{l} [H^{+}] = 10^{- p H} \\ [O H^{-}] = \frac{K_{w}}{[H^{+}]} \\ p K = - \log K \\ p K_{1} = 1.6 \\ p K_{2} = 5.97 \\ p K_{3} = 9.28 \end{array}$

$\begin{matrix} [α_{H_{2} A^{-}}] = \frac{{[H^{+}]}^{2} K_{1}}{{[H^{+}]}^{3} + {[H^{+}]}^{2} K_{1} + [H^{+}] K_{1} K_{2} + K_{1} K_{2} K_{3}} \\ [α_{H A^{2 -}}] = \frac{[H^{+}] K_{1} K_{2}}{{[H^{+}]}^{3} + {[H^{+}]}^{2} K_{1} + [H^{+}] K_{1} K_{2} + K_{1} K_{2} K_{3}} \\ [α_{A^{3 -}}] = \frac{K_{1} K_{2} K_{3}}{{[H^{+}]}^{3} + {[H^{+}]}^{2} K_{1} + [H^{+}] K_{1} K_{2} + K_{1} K_{2} K_{3}} \end{matrix}$

Spreadsheet

Spreadsheet developed

Graph Plot

The graph obtained from the above spreadsheet is depicted below

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Titrating triprotic acid with strong base.Prepare a spreadsheet to graph the titration of 50.0 mL of 0.020 0 M histidine^.2HCl with 0.100 M NaOH. Treat histidine^.2HCl with the triprotic acid equation in Table 11-5

Short Answer

Step by step solution

Information given

Equation need to be used to develop spreadsheet

Spreadsheet

Graph Plot

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Titrating triprotic acid with strong base.Prepare a spreadsheet to graph the titration of 50.0 mL of 0.020 0 M histidine.2HCl with 0.100 M NaOH. Treat histidine.2HCl with the triprotic acid equation in Table 11-5

Short Answer

Step by step solution

Information given

Equation need to be used to develop spreadsheet

Spreadsheet

Graph Plot

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Chemistry Textbooks

Ionic and Molecular Compounds

Physical Chemistry

The Earths Atmosphere

Chemistry Branches

Organic Chemistry

Chemical Analysis

Study anywhere. Anytime. Across all devices.

Titrating triprotic acid with strong base.Prepare a spreadsheet to graph the titration of 50.0 mL of 0.020 0 M histidine^.2HCl with 0.100 M NaOH. Treat histidine^.2HCl with the triprotic acid equation in Table 11-5