Data Table 1. Fill in the following chart using the collected data from your sec
ID: 1033297 • Letter: D
Question
Data Table 1. Fill in the following chart using the collected data from your section. (We will consider neutral to be 6.5-7.5)
pH with methyl red
Compare your values with other groups to make sure you have the same general values. Meaning they are appropriately acidic/basic/neutral.
Questions (use results from your data table where appropriate):
1. Compare the three pH determination methods in terms of speed, precision, and accuracy.
Indicator:
pH Paper:
pH Meter:
2. Using your overall data results:
a. List the salts experimentally determined to be acidic.
b. List the salts that are theoretically acidic (consult your textbook).
pH with methyl red
pH with phenolphthalein pH with bromothymol blue Conclusion pH from indicators pH w/ pH paper pH w/ pH meter Acidic/ Basic/Neutral Tap water n/a n/a n/a n/a 6 7.25 neutral Boiled water n/a n/a n/a n/a 6 7.05 neutral NH4Cl 6.3 <8.3 6.3 acidic 6 5.49 acidic Na3PO4 6.3> 10 7.3 basic 12 12.34 basic KCl 6 <8.3 6.5 acidic 4 5.32 acidic NaHCO3 6.3> 8.8 7.5 neutral 8 8.79 neutral Na2CO3 6.2 10 7.4 basic 12 11.63 basic Al2(SO4)3 4.5 <8.3 <6 acidic 4 3.92 acidic ~0.1 M HCl n/a n/a n/a n/a 4 4.33 acidic ~0.1 M NaOH n/a n/a n/a n/a 12 13.11 basicExplanation / Answer
1. Comparing different methods which were employed to calculate pH, the accurate, with less time taking, and most precise method is pH metric measurements.
Because, these are applicable to very dilute solutions and gives accurate values where as other two methods can't.
2. a) The salts that are experimentally acidic KCl, NH4Cl,Al2(So4)3
b) The salts that are theoritically acidic are Ammonium Chloride and Aluminum sulfate
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