Using the table of indicators identify which of the given indicators would be appropriate for the titration represented in the titration curve. metacresol purple Ometanil yellow thymolphthalein alizarin thymol blue ✔phenol red 32109 8 pH 7 6 5 4 3 2 0 2 4 Titration Curve 6 Volume of Titrant (mL) 8 10 12 14 16 18 20

Using the table of indicators identify which of the given indicators would be appropriate for the titration represented in the titration curve. metacresol purple Ometanil yellow thymolphthalein alizarin thymol blue ✔phenol red 32109 8 pH 7 6 5 4 3 2 0 2 4 Titration Curve 6 Volume of Titrant (mL) 8 10 12 14 16 18 20

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter15: Acid-base Equilibria

Section: Chapter Questions

Problem 18Q: Acidbase indicators mark the end point of titrations by magically turning a different color. Explain...

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Malonic acid (HO2CCH2CO2H) is a diprotic acid. In the titration of malonic acid w ith NaOH, stoichiometric points occur at pH = 3.9 and 8.8. A 25.00-mL sample of malonic acid of unknown concentration is titrated with 0.0984 M NaOH, requiring 31.50 mL of the NaOH solution to reach the phenolphthalein end point. Calculate the concentration of the initial malonic acid solution. (Sec Exercise 113.)
Given three acid-base indicatorsâ€”methyl orange (end point at pH 4), bromthymol blue (end point at pH 7), and phenolphthalein (end point at pH 9)â€”which would you select for the following acid-base titrations? (a) perchloric acid with an aqueous solution of ammonia (b) nitrous acid with lithium hydroxide (c) hydrobromic acid with strontium hydroxide (d) sodium fluoride with nitric acid
Using Figure 17.11, suggest an indicator to use in each of the following titrations: (a) The weak base pyridine is titrated with HCl. (b) Formic acid is titrated with NaOH. (c) Ethylenediamine, a weak diprotic base, is titrated with HCl. Figure 17.11 Common acid-base indicators. The color changes occur over a range of pH values. Notice that o few indicators hove color changes over two different pH ranges.
Draw the general titration curve for a strong acid titrated by a strong base. At the various points in the titration, list the major species present before any reaction takes place and the major species present after any reaction takes place. What reaction takes place in a strong acidstrong base titration? How do you calculate the pH at the various points along the curve? What is the pH at the equivalence point for a strong acidstrong base titration? Why?
Acidbase indicators mark the end point of titrations by magically turning a different color. Explain the magic behind acidbase indicators.