AP Chemistry
4.6 Introduction to Titration
4.5 Stoichiometry
A student titrates a sample of a monoprotic acid, \(\text{HA(aq)}\), with standardized \(\text{NaOH(aq)}\). The reaction is represented by
\(\text{HA(aq)}+\text{OH}^-\text{(aq)} \rightarrow \text{A}^-\text{(aq)}+\text{H}_2\text{O(l)}\)
Before the initial reading is recorded, an air bubble is trapped in the buret tip. During the titration, the bubble is expelled and the tip fills completely with the titrant. The student uses the difference between the final and initial buret readings to calculate the molarity of the acid. Which of the following correctly describes how the air bubble affects the calculated molarity of \(\text{HA(aq)}\)?
\(\text{HA(aq)}+\text{OH}^-\text{(aq)} \rightarrow \text{A}^-\text{(aq)}+\text{H}_2\text{O(l)}\)
| Quantity | Value |
|---|---|
| Volume of acid sample | \(25.00\text{ mL}\) |
| Concentration of \(\text{NaOH(aq)}\) | \(0.1000\text{ M}\) |
| Initial buret reading | \(0.30\text{ mL}\) |
| Final buret reading | \(25.30\text{ mL}\) |
Before the initial reading is recorded, an air bubble is trapped in the buret tip. During the titration, the bubble is expelled and the tip fills completely with the titrant. The student uses the difference between the final and initial buret readings to calculate the molarity of the acid. Which of the following correctly describes how the air bubble affects the calculated molarity of \(\text{HA(aq)}\)?
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