Lab 8 was an experiment on acid-base titration. In this experiment you titrated
ID: 483513 • Letter: L
Question
Lab 8 was an experiment on acid-base titration. In this experiment you titrated HCI with NaOH, an example of a strong acid titrated with a strong base, and compared it to a titration of acetic acid and NaoH, an example of a weak acid titrated by a strong base. The plot of the pHof an acid solution versus the volume of strong base produces what is known as a titration curve. In this extra credit assignment you are asked to calculate the pH for a 10.0 mL sample of 0.10 MHCI titrated in 1.000 mL increments with 0.10M NaoH. Below is a table for you to record the pH of an HCI solution throughout a titration. On the following pages are two approaches to determine the pH; the first method is typically taught and the second method is an alternative. On the last page you will be asked to answer a few survey questions to provide feedback about your impressions of the two methods. Your feedback will not be personally identifiable but will be extremely informative for we who teach acid-base titration. Please read through both methods before picking which one to use.Explanation / Answer
Titration of strong acid with strong base
mmoles [H+] = 0.1 M x 10 ml = 1 mmol
mmoles [OH-] = 0.1 M x volume of NaOH added
difference = moles [H+] - moles [OH-]
pH = -log[H+]
NaOH (ml) [H+] (mmol) [OH-] (mmol) difference pH
0 1 0 1 1
1 1 0.1 0.9 1.09
2 1 0.2 0.8 1.18
3 1 0.3 0.7 1.27
4 1 0.4 0.6 1.37
5 1 0.5 0.5 1.48
6 1 0.6 0.4 1.60
7 1 0.7 0.3 1.75
8 1 0.8 0.2 1.95
9 1 0.9 0.1 2.28
10 1 1.0 0 7
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