Table 2: Calibration of Beaker (30 mL), Erlenmeyer (25mL) and Volumetric Flas d
ID: 714782 • Letter: T
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Table 2: Calibration of Beaker (30 mL), Erlenmeyer (25mL) and Volumetric Flas d Volumetric Flask (25 ml) Trial M () M (B) 0.0002. MH20 (g) 0.0002 V42o (ml) 0.0003 +0.0002 30 mL Beaker (DI H20 temp 1 1.4571 46,8050 24,7 2 21.445a2 45.4 23619 24,1925 23. 661 23. 429 74479 Average Stddev % RSD 95 % CI % error 25 mL Erlenmeyer (DI H2O temp 27. 2415 51.4143 24.17 28 1 Average Stddev % RSD 95 % Cl % error 25 mL Volumetric Flask (DI H20 temp 1 1. 2415 51.I 24.35 24. 9149 221, 3205 52.0422 24 1217 244.9009 Average Stddev % RSD 95 % Cl % error These error values are associated with the electronic balancesExplanation / Answer
For the first beaker:
No. of measurements (n) = 3
a) Average = (24.7925 + 23.6618 + 23.4299)/3 = 23.9614
b) The standard deviation = {(24.7925-23.9614)2 + (23.6618-23.9614)2 + (23.4299-23.9614)2/(3-1)}1/2
= 0.729
c) % RSD = % Relative Standard Deviation = (standard deviation/average)*100
= (0.729/23.9614)*100
= 3.04%
d) 95% Confidence level = 1.96*standard deviation/(n)1/2
= 1.96*0.729/(3)1/2
= 0.825
Therefore, the 95% Confidence interval = average ± 95% confidence level
= 23.9614 ± 0.825
= 23.1364 to 24.7864
e) % Relative error = (Absolute error/actual value)*100
Absolute error = Actual value - measured value
Note: Similarly measure a, b, c, d, and e in the case of the remaining two beakers.
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