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Sulfate Analysis & Error Evaluation

The document contains results from 3 trials of analyzing the weight percentage of SO42- in samples. It reports the weights of the sample, empty filter paper, filter paper + residue, and residue for each trial. It then shows the calculated weight and percentage of SO42- for each trial. It further describes calculating the theoretical yield of BaSO4 based on a chemical reaction and uses this to determine a 1.699% percent error. Finally, it presents the statistical analysis of the results, including the mean, median, range, and standard deviation.

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jessa mae
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72 views1 page

Sulfate Analysis & Error Evaluation

The document contains results from 3 trials of analyzing the weight percentage of SO42- in samples. It reports the weights of the sample, empty filter paper, filter paper + residue, and residue for each trial. It then shows the calculated weight and percentage of SO42- for each trial. It further describes calculating the theoretical yield of BaSO4 based on a chemical reaction and uses this to determine a 1.699% percent error. Finally, it presents the statistical analysis of the results, including the mean, median, range, and standard deviation.

Uploaded by

jessa mae
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Table 1.

Summary of Results

Parameters Trial 1 Trial 2 Trial 3


Weight of sample (Unknown) 0.3235g 0.3324g 0.3128g
Weight of empty filter paper (g) 1.6410g 1.6232g 1.6409g
Weight of filter paper + residue (g) 2.0320g 2.0285g 1.9485g
Weight of residue (BaSO4) (g) 0.391g 0.4053g 0.3076g
Weight of SO42- (g) 0.1609g 0.1668g 0.1266g
% SO42- 50% 50.18% 40.47%

The table 2 shows the statistical evaluation of the % SO42- were the percent error is equal to 1.699%. To
get the value of percent error, calculate first the theoretical yield and then compare it to the actual yield which is
0.1514. The sample calculation for the % error was shown below.

MSO4 + BaCl2 ----- BaSO4 + MCl2

1 𝑚𝑜𝑙𝑒 1 𝑚𝑜𝑙𝑒 𝐵𝑎𝑆𝑂4 233.38𝑔


0.1514SO4 × SO4 × × BaSO4 = 0.3678g BaSO4
96.06𝑔 1 𝑚𝑜𝑙𝑒 𝑜𝑓 𝑆𝑂4 1 𝑚𝑜𝑙𝑒

Theoretical yield = Average of SO4 − 0.3678g BaSO4 = -0.2164

𝑎𝑐𝑡𝑢𝑎𝑙 𝑣𝑎𝑙𝑢𝑒−𝑡ℎ𝑒𝑜𝑟𝑒𝑡𝑖𝑐𝑎𝑙 𝑣𝑎𝑙𝑢𝑒 0.1514−(−0.2164)


% Error = × 100 = × 100 = 1.699%
𝑡ℎ𝑒𝑜𝑟𝑒𝑡𝑖𝑐𝑎𝑙 𝑣𝑎𝑙𝑢𝑒 −0.2164

Table 2. Statistical Evaluation

STATISTICAL PARAMETER RESULTS


Mean 46.88
Median 50
Range 9.71
Average Deviation 0.0033 or 3.33x10-3
Standard Deviation, s 5.55
Relative Standard Deviation (RSD) 11.84
% Error 1.699%
Reported Value 124.5

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