Answer :
Final answer:
The question is asking about the pH of a mixed solution of HCl, a strong acid, and acetic acid, a weak acid. The strong acid will completely dissociate, while the weak acid will not, creating a buffer system that determines the pH. To find the pH, the Henderson-Hasselbalch equation, a formula used to calculate the pH of a buffer solution, can be applied.
Explanation:
In order to answer the question: '10 mL of 0.0100 M HCl are added to 20 mL of 0.0100 M acetic acid. What is the pH of the resulting solution?', we first need to determine the final concentration of HCl and acetic acid in the mix. We have 0.1 mmol of HCl and 0.2 mmol of acetic acid in a 30 mL solution. While HCl is a strong acid and will completely dissociate, acetic acid is a weak acid and will not. This creates a buffer system with the acetate created by HCl and acetic acid reaction. To find the pH, you can use the buffer formula, known as the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]). In this case, [A-] is the acetate ion concentration and [HA] is the remaining acetic acid concentration.
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