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Acid Buffering Capacities of Water

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Format: Answers to Questions 4 to 6 should fit on 2 pages MAXIMUM, double- spaced, Times New Roman 12 pt font, including figures. Your report must include the following: 1. Completed Tables from Lab 3 – Parts and B (10 marks) Lab 3 Part A: Table 1 – Known (bottled) water sample Lab 3 Part B: Table 2 – Unknown water sample 2. Calculate the Gran function (see Fig 1) for two of the titrations you completed for each water sample. (10 marks) For each titration to be plotted, use the data collected in either Table 1 or Table 2, to create a Gran Function plot analysis: A table reporting the following values for each addition of titrant (with the appropriate units), starting with the initial pH (i.e. before the titrant was added): pH, Vt, V 0 + Vt, 10-pH, and (V 0 + V t)(10-pH) **Attach each table (you should in total have four of them) to your report 3. Plot the Gran Function (F1) of each titration. (20 marks) Use the data tabulated and calculated in section 2, to this end (see Figure 1, Part B). For each plot, do not forget to extrapolate the intercept of the Gran Function with the X-axis. 4. Calculate and report in a table the associated ANC values. Calculate the mean ANC in meq L-1 of your samples. (6 marks) Use appropriate statistics. Show one sample calculation of the entire process. This section should fit on no more than one page. (continued on next page) 13 5. Discuss and compare the relative buffering capacities of the two water samples you analyzed. (5 marks) Make sure you do not simply state the results and obvious findings; i.e. sample X had a higher buffering capacity than sample Y. You must provide some level of interpretation and discussion for full marks. For instance, explain the values of the buffering capacities (e.g. what would make them high, moderate or low) in relation to what you know about the samples and where they are from. Try to give some explanation of the mechanism behind these capacities; you may refer to your textbook or other sources as support for your argument. This section should fit on no more than half a page.Format: Answers to Questions 4 to 6 should fit on 2 pages MAXIMUM, double- spaced, Times New Roman 12 pt font, including figures. Your report must include the following: 1. Completed Tables from Lab 3 – Parts and B (10 marks) Lab 3 Part A: Table 1 – Known (bottled) water sample Lab 3 Part B: Table 2 – Unknown water sample 2. Calculate the Gran function (see Fig 1) for two of the titrations you completed for each water sample. (10 marks) For each titration to be plotted, use the data collected in either Table 1 or Table 2, to create a Gran Function plot analysis: A table reporting the following values for each addition of titrant (with the appropriate units), starting with the initial pH (i.e. before the titrant was added): pH, Vt, V 0 + Vt, 10-pH, and (V 0 + V t)(10-pH) **Attach each table (you should in total have four of them) to your report 3. Plot the Gran Function (F1) of each titration. (20 marks) Use the data tabulated and calculated in section 2, to this end (see Figure 1, Part B). For each plot, do not forget to extrapolate the intercept of the Gran Function with the X-axis. 4. Calculate and report in a table the associated ANC values. Calculate the mean ANC in meq L-1 of your samples. (6 marks) Use appropriate statistics. Show one sample calculation of the entire process. This section should fit on no more than one page. (continued on next page) 13 5. Discuss and compare the relative buffering capacities of the two water samples you analyzed. (5 marks) Make sure you do not simply state the results and obvious findings; i.e. sample X had a higher buffering capacity than sample Y. You must provide some level of interpretation and discussion for full marks. For instance, explain the values of the buffering capacities (e.g. what would make them high, moderate or low) in relation to what you know about the samples and where they are from. Try to give some explanation of the mechanism behind these capacities; you may refer to your textbook or other sources as support for your argument. This section should fit on no more than half a page.

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Table 1: Acid Neutralizing Capacity of Known Water Sample (Bottled)
Titration 1 Titration 2 Titration 3
Starting pH 7.26 Starting pH 7.35 Starting pH
Normality of acid 0.1 Normality of acid 0.1 Normality of acid
Volume of sample
Volume of sample ( 100 Volume of sample (mL) 100
(mL)
Total volume of
Total volume of acid added
5.63
toTotal
reachvolume
pH 4.5of
(mL)
acid added to reach pH
5.54
4.5acid
(mL)
added to
reach pH 4.5 (mL)
Individual Increments of
Individual Increments of ac Individual Increments of acid added bel acid added below pH 4.5
(mL)
Volume added Volume added
pH pH Volume added (mL) pH
(mL) (mL)
e.g.: 4.4 e.g.: 0.01 e.g.: 4.4 e.g.: 0.01 e.g.: 4.4 e.g.: 0.01
e.g.: 4.3 e.g.: 0.01 e.g.: 4.3 e.g.: 0.01 e.g.: 4.3 e.g.: 0.01
4.6 0 4.55 0 4.6 0
4.29 0.09 4.05 0.08 4.14 0.11
4.1 0.03 3.86 0.06 3.92 0.06
3.68 0.12 3.71 0.05 3.8 0.04
3.56 0.06 3.57 0.09 3.67 0.07
3.43 0.08 3.48 0.04 3.6 0.02
3.36 0.04 3.4 0.04 3.51 0.03
3.3 0.09 3.34 0.08 3.44 0.08
3.25 0.08 3.29 0.07 3.37 0.08
3.21 0.09 3.25 0.09 3.3 0.11
3.18 0.03 3.2 0.07 3.26 0.07
3.14 0.08 3.17 0.04 3.2 0.05
3.08 0.07 3.1 0.16 3.17 0.08

Vo 100

Titration 1 Titration 2
pH Vt Vo + Vt 10-pH (Vo + Vt ) (10-pH) pH Vt
7.26 0 100 5.495409E-08 5.49540873858E-06 7.35 0
4.6 5.63 105.63 2.511886E-05 0.0026533056376 4.55 5.54
4.29 5.72 105.72 5.128614E-05 0.00542197055156 4.05 5.62
4.1 5.75 105.75 7.943282E-05 0.00840002108221 3.86 5.68
3.68 5.87 105.87 0.0002089296 0.02211937813735 3.71 5.73
3.56 5.93 105.93 0.0002754229 0.02917554465446 3.57 5.82
3.43 6.01 106.01 0.0003715352 0.03938644963659 3.48 5.86

, 3.36 6.05 106.05 0.0004365158 0.04629250400907 3.4 5.9
3.3 6.14 106.14 0.0005011872 0.0531960129772 3.34 5.98
3.25 6.22 106.22 0.0005623413 0.05973189556172 3.29 6.05
3.21 6.31 106.31 0.000616595 0.06555021464789 3.25 6.14
3.18 6.34 106.34 0.0006606934 0.07025814126113 3.2 6.21
3.14 6.42 106.42 0.000724436 0.07709447487118 3.17 6.25
3.08 6.49 106.49 0.0008317638 0.08857452398472 3.1 6.41

A GRAN FUNC
A GRAN FUNCTION PLOT OF (Vo + Vt ) (10-pH)
AGAINST Vt
0.09

VOLUME OF TITRANT Vt IN ML
0.1 0.08 f(x) = 0
0.09 R² = 0.
0.07
(Vo + Vt ) (10-pH) IN ML

0.08 f(x) = 0.101540573402893 x − 0.572435845615965
R² = 0.992087075568489 0.06
0.07
0.05
0.06
0.05 0.04
0.04 0.03
0.03 0.02
0.02 0.01
0.01 0
0 5.4 5.6
5.4 5.6 5.8 6 6.2 6.4 6.6

VOLUME OF TITRANT Vt IN ML

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Aantal pagina's: 12
Geschreven in: 2022/2023
Type: OVERIG
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