Answer:
Ka = 3.50x10⁻⁴
Explanation:
First, we need to convert the unit of 3.60 g/L to mol/L:
The reaction dissociation of aspirin in water is:
C₉H₈O₄ + H₂O ⇄ C₉H₇O₄⁻ + H₃O⁺
0.02 - x x x
The constant of the above reaction is:
To find Ka we need to find the value of x. We know that pH = 2.6 so:
Now, the concentration of C₉H₈O₄ is:
Finally, Ka is:
Therefore, the Ka of aspirin is 3.50x10⁻⁴.
I hope it helps you!