Titration. What is It? Acid and base combined together Graph of pH as a function of volume of...
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Transcript of Titration. What is It? Acid and base combined together Graph of pH as a function of volume of...
![Page 1: Titration. What is It? Acid and base combined together Graph of pH as a function of volume of titrant is called a titration curve.](https://reader031.fdocuments.net/reader031/viewer/2022032311/56649db15503460f94aa04ef/html5/thumbnails/1.jpg)
Titration
![Page 2: Titration. What is It? Acid and base combined together Graph of pH as a function of volume of titrant is called a titration curve.](https://reader031.fdocuments.net/reader031/viewer/2022032311/56649db15503460f94aa04ef/html5/thumbnails/2.jpg)
What is It?
Acid and base combined together Graph of pH as a function of volume of
titrant is called a titration curve
![Page 3: Titration. What is It? Acid and base combined together Graph of pH as a function of volume of titrant is called a titration curve.](https://reader031.fdocuments.net/reader031/viewer/2022032311/56649db15503460f94aa04ef/html5/thumbnails/3.jpg)
Titration Curve for Strong Acid/Strong Base
![Page 4: Titration. What is It? Acid and base combined together Graph of pH as a function of volume of titrant is called a titration curve.](https://reader031.fdocuments.net/reader031/viewer/2022032311/56649db15503460f94aa04ef/html5/thumbnails/4.jpg)
Equivalence Point At equivalence point there is the same
moles of acid and base No buffering occurs in strong acid and
base titration What would curve for a strong base
titrated by a strong acid look like?
![Page 5: Titration. What is It? Acid and base combined together Graph of pH as a function of volume of titrant is called a titration curve.](https://reader031.fdocuments.net/reader031/viewer/2022032311/56649db15503460f94aa04ef/html5/thumbnails/5.jpg)
Example
How many ml of .50 M NaOH are required to reach the equivalence point by titrating 50.0 ml of .40M HBr?
![Page 6: Titration. What is It? Acid and base combined together Graph of pH as a function of volume of titrant is called a titration curve.](https://reader031.fdocuments.net/reader031/viewer/2022032311/56649db15503460f94aa04ef/html5/thumbnails/6.jpg)
Example: Strong Acid/Base
50.0 mL of 0.200M HNO3 solution is titrated with 0.100M NaOH. What is the pH after the following amounts of base are added?
a) 50.0 mL
b) 100.0 mL
c) 200.0 mL
![Page 7: Titration. What is It? Acid and base combined together Graph of pH as a function of volume of titrant is called a titration curve.](https://reader031.fdocuments.net/reader031/viewer/2022032311/56649db15503460f94aa04ef/html5/thumbnails/7.jpg)
Weak Acid/Strong Base Titration Curve
pH starts higher Rapid rise and then levels into a zone where
pH doesn’t change much (buffering zone) When enough base added to neutralize ½
acid – called half equivalence pt. (middle of buffer zone and pH = pKa)
pH at equivalence pt is greater than 7
![Page 8: Titration. What is It? Acid and base combined together Graph of pH as a function of volume of titrant is called a titration curve.](https://reader031.fdocuments.net/reader031/viewer/2022032311/56649db15503460f94aa04ef/html5/thumbnails/8.jpg)
![Page 9: Titration. What is It? Acid and base combined together Graph of pH as a function of volume of titrant is called a titration curve.](https://reader031.fdocuments.net/reader031/viewer/2022032311/56649db15503460f94aa04ef/html5/thumbnails/9.jpg)
![Page 10: Titration. What is It? Acid and base combined together Graph of pH as a function of volume of titrant is called a titration curve.](https://reader031.fdocuments.net/reader031/viewer/2022032311/56649db15503460f94aa04ef/html5/thumbnails/10.jpg)
What is the value for the Ka of the weak acid titrated as shown?
![Page 11: Titration. What is It? Acid and base combined together Graph of pH as a function of volume of titrant is called a titration curve.](https://reader031.fdocuments.net/reader031/viewer/2022032311/56649db15503460f94aa04ef/html5/thumbnails/11.jpg)
Example
Draw a titration curve for a weak base (pH = 11.5 and Kb = 1.8 x 10-5) titrated with a strong acid (pH = 1). On the curve indicate:
a) Equivalence pointb) Buffering zone
c) Where pH = pKb
d) Where pH depends only on basee) Where pH depends only on acid
![Page 12: Titration. What is It? Acid and base combined together Graph of pH as a function of volume of titrant is called a titration curve.](https://reader031.fdocuments.net/reader031/viewer/2022032311/56649db15503460f94aa04ef/html5/thumbnails/12.jpg)
Polyprotic Acid Curves