% Mgo Determination

Vu Ngo % MgO Determination September 10, 2012 Procedure adduce to lab manual Data Mass of Na2EDTA2H2O, g . 9289 Standardization of EDTA issue run 1 Trial 2 Final burette reading, EDTA (mL) 18. 5 36. 7 Initial buret reading, EDTA(mL) 0. 5 18. 5 Determination of % MgO of nameless Unknown Number 4J establish 1 exemplar 2 Sample 3 Mass of savour (g) 0. 2135 0. 2132 0. 2139 Final buret reading, EDTA (mL) 73. 5 74. 2 74. 2 Initial buret reading, EDTA(mL) 0. 5 0 0 metre of water blank Final buret reading, EDTA(mL) 14. 5 Initial buret reading, EDTA(mL) 14. 2 Sample CalculationGiven Molar mass of Na2EDTA*2H2O, g/mol 372. 25 Expected M of EDTA solution, mol/L (M) 0. 01 tautness of Zn2+, (M) 0. 0125 10mL*1L1000mL= 0. 01L C1V1=C2V2 .0125M. 010L)=C2(. 018L) C2=. 0125M*. 0100L. 0180L=. 00694M .00694M+. 0687M2=. 00691M C2=. 00691M. 073=5. 04*10-4mol %MgO=5. 04*10-4mol40. 05. 2135g*100=9. 51% Results Standardization of EDTA Solution Trial 1 Trial 2 Volume used, EDTA(mL) 18. 0 18. 2 me tre of EDTA solution, (M) 0. 00694 0. 00687 Average Molarity of EDTA solution, (M) 0. 00691 Determination of % MgO of Unknown Sample 1 Sample 2 Sample 3 Volume used, EDTA (mL) 73. 74. 2 74. 2 Mole of Mg2+in examine 5. 04E-04 5. 12E-04 5. 12E-04 % of MgO in hear, % 9. 52 9. 69 9. 66 Average % of MgO in sample, % 9. 62 Error Analysis The step of the sample in gram, have +/- . 0001g error. The measurement using the the buret have a +/- . 1mL error. These types of measurement error ar trading floord on the sensitivity of the instrument, during the measurement. These errors could cause the end to deviate from the real(a) answer. During the experiment, using titration to recollect the end point. Because of the end point was unknown, a superstar send away could determine its end point.There might be an extra drop that caused the data to vary as both parts of the experiment have determined. The first runnel of both the experiment, the number is different, because of the unsure number of drops. victimization the result from the first trial, the result of the second trial was more accurate. As proven from the experiment of determination of percent of MgO of the unknown. The sample 2 and sample 3 testing results in similarity that differ from the sample one. The sample used 73. 0 ml of the EDTA solution, while both samples 2 and 3 used 74. 2 ml of EDTA solution.This will cause a percentage point in the result toward a lower number used to find the end point. This error is not a major factor since it is just now of my 1. 2 ml of the actual result. The percent of all three result of MgO is different under 1 percent different. Thus, a very well-founded result in all three of the experiment. Discussion This experiment is to protagonist us understand the reaction between an anion and the metal cation. It demonstrated the Lewis base understanding of ethylenediaminetetraacetic acid (EDTA). The goal was achieved through titration of the sample in ninefold trial s in order to find its expiry.The end point was found when the wiretap coloration, due to EBT was added, turn into a blue/ violet color. This signified its endpoint of the sample. The result is good quality, because of the deviation from the first trial and last trial that was done on the same sample. The result is off by . 2ml in the standardization of EDTA solution. In the second part of the determination of % MgO of the unknown the first, second, and tercet sample the percentage displaces is well under 1% difference. The result is worthy 99% confident that the result is good quality, because of the consistency of the data.