A 50.00-mL aliquot of 0.0500 M formic acid (Ka = 1.80 x 10-4) is titrated with 0.0500 M strong base. a. What is the pH of the solution before any strong base has been added? b. What is the pH of the solution after 10.00 mL strong base has been added? c. What is the pH of the solution after 25.00 mL strong base has been added?
A 50.00-mL aliquot of 0.0500 M formic acid (Ka = 1.80 x 10-4) is titrated with 0.0500 M strong base.
a. What is the pH of the solution before any strong base has been added?
b. What is the pH of the solution after 10.00 mL strong base has been added?
c. What is the pH of the solution after 25.00 mL strong base has been added?
d. What is the pH of the solution after 40.00 mL strong base has been added?
e. What is the pH of the solution after 50.00 mL strong base has been added?
f. What is the pH of the solution after 60.00 mL strong base has been added?
Give the name of another weak acid with a titration curve that is similar to this one. Explain the similarities in a few sentences.
![Weak Acid vs. Strong Base Titration Curve
12
Titration of weak acid HA with strong base OH
НА + Он А+ Н,о
Equivalence point
A- + H,0 =HA + OH-
F'-X
x2
= Kp
F'-X
Excess OH-
K
pH = - log OH)
Buffer region
[A]
pH = pK, + log
[HA]
Initial point
HA-H +A
F-X X
= K,
F-X
20
40
60
Volume of base added (V)
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