6. Weighing Data for 3 trials Calculate the difference between mass delivered by

Question

6. Weighing Data for 3 trials Calculate the difference between mass delivered by each technique and also the percent error between the masses of NaCI using the "By Difference" value of mass of NaCI as closest to the accepted. #1 ByDifference (g) Mass of vial with NaCl Empty beaker298y& Mass of vial less some Naci I6 2318 Mass NaCI Beaker plus NacI 30 I7il Mass NaC62863 6.286 o.oco40 Absolute Percent errorfrR15%.asaly% Mass Difference By Addition (g) Mass of vial with NacI 88884 Mass of vial less some NaCI 8 oua 0 8463 Empty beaker 29,3818 Beaker plus Naci 36 7378 Mass Naci 860 Mass NaCI Mass Difference_6 00030Absolute Percent error G3S #3 ByDifference(e) Mass of vial with NaCI 18,04a Mass of vial less some Naci Mass NaCI Empty beaker 29.&834 3,888 Beaker plus NacI 30 0 Mass NaCI LOiSo Mass Differenceo.co030 0.630%. Absolute Percent error 7. Statistical analysis. mean percent error 0.068% Relative Standard Deviation from the Mean (in percent) What are the justifications for rules 2 and 5 of the "Rules for Use of an Analytical balance" sted in the Manual?

Explanation / Answer

Relative standard deviation = (Standard deviation *100) / average of data

standard deviation, S ={ (xn - x avg. ) 2 /(n-1)}0.5

Average = (0.0004 + 0.0003 + 0.0003) / 3

= 0.00033

standard deviation, S = [ {(0.0004- 0.00033)2 +  (0.0003- 0.00033)2 +  (0.0003- 0.00033)2} / n-1 ]0.5

= 5.3851 * 10 -5

Relative standard deviation = {(5.3851 * 10 -5) * 100 } /  0.00033

= 16.31 %

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