Acid-Base Lab. 1. Based on these results, which of the three solutions (A, B or

Question

Acid-Base Lab. 1. Based on these results, which of the three solutions (A, B or C) is the best buffer? Explain your answer with any appropriate calculation.
2. If you were to record the color of the solution and pH, when would you stop recording?
3. Experiment 3: Based on the results, which of the three solutions (X, Y, Z) is the best buffer? Explain your answer thoroughly. Should this be different from answer #2 or not? Experiment 2: You examine the buffering capacity of three unknown solutions by conducting an experiment where you add 0.01N HCl to each solution until the solution is neutralized. The initial pH of each solution is recorded in Table 2 below. You record the amount of HCl added to each beaker to reach neutralization. Table 2: Bufferi Solution (10 ml)Initial pHHCI added to reach neutralization (pH experimental results 8.0 9.0 10 20 2. [ 3 pts] Based on the results, which of the three solutions, A, B, or C, is the best buffer? Explain your answer with any appropriate calculation. Also use evidence from your own lab's results for the last Exercise 3. [ 3 pts ] In the last Exercise of the lab, you're supposed to record the color of the solution and the pH of the solution. When do you stop recording? Why? Experiment 3: You examine the buffering capacity of three other unknown solutions by adding 0.01N 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 Solution (10 ml) Initial color NaOH added to reach neutralization (pH experimental results 7.0) 20 10 4. [ 4 pts ] 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

2.ans. Buffer capacity is defined by the ability of the buffer to resist changes in its pH.Buffer capacity is expressed as gram equivalents of strong acid or base required to be added to 1 liter of the solution to alter its pH by one unit.

The solution C(pH=8.5) which required 20 drops of 0.01(N) HCl to reach neytralization pH can be adjudged to be the best buffer.

3. ans. The recording should be stopped at once as the colour changes.

4.ans.For the reasons enlisted in (2), solution X is the best buffer.

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