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Calculate the pH of buffer solution made from 0.2M HC2H3O2 and 0.5M C2H3O2 that has acid dissociation constant for HC2H3O2 of 1.8×10-5?
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Calculate the pH of buffer solution made from 0.2M HC2H3O2 and 0.5M C2...
pH Calculation of Buffer Solution
Given:
- Concentration of HC2H3O2 (acetic acid) = 0.2 M
- Concentration of C2H3O2 (acetate ion) = 0.5 M
- Acid dissociation constant (Ka) for HC2H3O2 = 1.8×10-5
Buffer Solution:
A buffer solution is a solution that resists changes in pH when small amounts of acid or base are added to it. It consists of a weak acid and its conjugate base (or a weak base and its conjugate acid) in approximately equal concentrations.
In this case, the buffer solution is made from acetic acid (HC2H3O2) and acetate ion (C2H3O2).
Buffer Action:
The buffer solution works through the principle of the common ion effect. When a strong acid is added to the buffer, the acetate ion reacts with the added H+ ions to form acetic acid, thus minimizing the change in pH. Similarly, when a strong base is added, the acetic acid reacts with OH- ions to form acetate ion, preventing a significant change in pH.
pH Calculation:
To calculate the pH of the buffer solution, we need to consider the dissociation of acetic acid (HC2H3O2) and the equilibrium expression for Ka.
Step 1:
Write the balanced equation for the dissociation of acetic acid:
HC2H3O2 ⇌ H+ + C2H3O2-
Step 2:
Write the equilibrium expression for the acid dissociation constant (Ka):
Ka = [H+][C2H3O2-] / [HC2H3O2]
Step 3:
Since the concentration of HC2H3O2 and C2H3O2 are given, we can substitute these values into the equilibrium expression:
1.8×10-5 = [H+][0.5] / [0.2]
Step 4:
Solve the equation for [H+]:
[H+] = (1.8×10-5)(0.2) / 0.5
[H+] = 7.2×10-6 M
Step 5:
Calculate the pH using the formula:
pH = -log[H+]
pH = -log(7.2×10-6)
pH ≈ 5.14
Conclusion:
The pH of the buffer solution made from 0.2 M HC2H3O2 and 0.5 M C2H3O
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Calculate the pH of buffer solution made from 0.2M HC2H3O2 and 0.5M C2H3O2 that has acid dissociation constant for HC2H3O2 of 1.8×10-5?
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Calculate the pH of buffer solution made from 0.2M HC2H3O2 and 0.5M C2H3O2 that has acid dissociation constant for HC2H3O2 of 1.8×10-5? for Chemistry 2024 is part of Chemistry preparation. The Question and answers have been prepared according to the Chemistry exam syllabus. Information about Calculate the pH of buffer solution made from 0.2M HC2H3O2 and 0.5M C2H3O2 that has acid dissociation constant for HC2H3O2 of 1.8×10-5? covers all topics & solutions for Chemistry 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Calculate the pH of buffer solution made from 0.2M HC2H3O2 and 0.5M C2H3O2 that has acid dissociation constant for HC2H3O2 of 1.8×10-5?.
Calculate the pH of buffer solution made from 0.2M HC2H3O2 and 0.5M C2H3O2 that has acid dissociation constant for HC2H3O2 of 1.8×10-5? for Chemistry 2024 is part of Chemistry preparation. The Question and answers have been prepared according to the Chemistry exam syllabus. Information about Calculate the pH of buffer solution made from 0.2M HC2H3O2 and 0.5M C2H3O2 that has acid dissociation constant for HC2H3O2 of 1.8×10-5? covers all topics & solutions for Chemistry 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Calculate the pH of buffer solution made from 0.2M HC2H3O2 and 0.5M C2H3O2 that has acid dissociation constant for HC2H3O2 of 1.8×10-5?.
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