Chemistry: An Atoms-Focused Approach
14th Edition
ISBN: 9780393912340
Author: Thomas R. Gilbert, Rein V. Kirss, Natalie Foster
Publisher: W. W. Norton & Company
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Students have asked these similar questions
The graph shows the titrations of two unknown acids with the same base.
Identify the stronger acid and the weaker acid. Support your identifications by
estimating the K, of each acid.
Unknown acid A
13.0
Unknown acid B
12.0
11.0
10.0
9.0
8.0
품 7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
0.0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
16.0
Volume of added base (mL)
Using suitable curves explain the variations in titration curves obtained
between the titration of a strong acid with a strong base and the
titration of weak acid with a strong base.
Which is the best definition of the equivalence point for an acid-base titration?
The equivalence point is when the concentration of the acid is equal to the number of moles of base.
The equivalence point is when the solution turns from pink to clear.
The equivalence point is when the solution turns from clear to pink.
The equivalence point is when the number of moles of titrant added equals the number of moles of sample being titrated.
O The equivalence point is when the volume of titrant added equals the volume of the solution being titrated.
O O
O O O
Chapter 15 Solutions
Chemistry: An Atoms-Focused Approach
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- You are given the following acidbase titration data, where each point on the graph represents the 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 pH at the equivalence point of the tiration? c What indicator might you use to perform this titration? Explain.arrow_forwardThe titration curves for two acids with the same base are shown on this graph. (a) Which is the curve for the weaker acid? Explain your choice. (b) Give the approximate pH at the equivalence point for the titration of each acid. (c) Explain why the pH at the equivalence point differs for each acid. (d) Explain why the starting pH values of the two acids differ. (e) Which indicator or indicators, phenolphthalein, bromthymol blue, or methyl red, could be used for the titration of Acid 1? For the titration of Acid 2? Explain your choices.arrow_forwardConsider the nanoscale-level representations for Question 110 of the titration of the aqueous weak acid HX with aqueous NaOH, the titrant. Water molecules and Na+ ions are omitted for clarity. Which diagram corresponds to the situation: After a very small volume of titrant has been added to the initial HX solution? When enough titrant has been added to take the solution just past the equivalence point? Halfway to the equivalence point? At the equivalence point? Nanoscale representations for Question 110.arrow_forward
- Explain why even though an aqueous acetic acid solution contains acetic acid and acetate ions, it cannot be a buffer.arrow_forwardDraw 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?arrow_forwardWithout doing calculations, determine the pH of a buffer made front equimolar amounts of these acid-base pairs. (a) Nitrous acid and sodium nitrite (b) Ammonia and ammonium chloride (c) Formic acid and potassium formatearrow_forward
- Identify each pair that could form a buffer. (a) NaOH and NaCl (b) NaOH and NH3 (c) Na3PO4 and Na2HPO4arrow_forwardIn the titration of a strong acid (the analyte) with a strong base (the titrant), what type of pH problem must be solved if the titration is stopped at any point after the equivalence point?arrow_forwardThe equivalence point in a titration occurs when the amount of acid added is equal to one-half of the amount of base added. True Falsearrow_forward
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