ALANCE POST-LAB Q- Sear Share Heading1N Subtitle Subile Emph.. Emphasis Styles H

Question

ALANCE POST-LAB Q- Sear Share Heading1N Subtitle Subile Emph.. Emphasis Styles Heading 2 Title Pane Experiment 3: You examine the buffering capacity of three other unknown solutions by adding 001N NaOH to each solution until the solution is neutralized. Phenol red is used to indicate the pH of the solution (basic, neutral, or acidic). The initial color of each solution is recorded in Table 3 below. You record the amount of NaOH added to each beaker to reach neutralization. Table 3: Buffering capacity experimental results Solution (10 m) Initial color NaOH added to reach neutralization (pH 7.0) yelow yellow yellow 20 drops 10 drops 4 drops 4. 14 pts 1 Based on the results, which of the three solutions, X, Y, or Z, is the best buffer? Explain your answer thoroughly. Should this be different from #2 or not? Explain thoroughly

Explanation / Answer

Buffer capacity of any solution is measure of resistance of that solution to pH change when strong acid or strong base is added to the solution. The solution which shows maximum resistance is the best buffer solution. Resistance is measured by the amount of strong acid or strong base it can accept without change in pH. The more the strong acid or base, it can accept without any pH change, the more resistance the solution will be. By applying this knowledge, in the given question, the solution X accept 20 drops of NaOH solution, which is more than that of solution Y and solution Z. So the solution X is the best buffer in the given solutions.

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