% Mgo Determination

Topics: Titration, Mole, Error Pages: 3 (653 words) Published: November 11, 2012
Vu Ngo
% MgO Determination
September 10, 2012

Reference to lab manual
Mass of Na2EDTA∙2H2O, g| .9289|
Standardization of EDTA Solution
| Trial 1| Trial 2|
Final buret reading, EDTA (mL)| 18.5| 36.7|
Initial buret reading, EDTA(mL)| 0.5| 18.5|
Determination of % MgO of Unknown
Unknown Number | 4J|
| Sample 1| Sample 2| Sample 3|
Mass of sample (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|
Measurement of water blank
Final buret reading, EDTA(mL)| 14.5|
Initial buret reading, EDTA(mL)| 14.2|
Sample Calculation:
Molar mass of Na2EDTA*2H2O, g/mol| 372.25|
Expected M of EDTA solution, mol/L (M)| 0.01|
Concentration of Zn2+, (M)| 0.0125|

10mL*1L1000mL= 0.01L
Standardization of EDTA Solution
| Trial 1| Trial 2|
Volume used, EDTA(mL)| 18.0| 18.2|
Molarity 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)| 73.0| 74.2| 74.2|
Mole of Mg2+in sample| 5.04E-04| 5.12E-04| 5.12E-04|
% of MgO in sample, %| 9.52| 9.69| 9.66|
Average % of MgO in sample, %| 9.62|

Error Analysis:
The measurement of the sample in gram, have +/- .0001g error. The measurement using the the buret have a +/- .1mL error. These types of measurement error are based on the sensitivity of the instrument, during the measurement. These errors could cause the result to deviate from the actual answer. During the experiment, using titration to find the end point. Because of the end point was unknown, a single drop could determine its end point. There might be an extra drop that caused...
Continue Reading

Please join StudyMode to read the full document

You May Also Find These Documents Helpful

  • Sex Determination in Forensic Odontology Essay
  • Self Determination Essay
  • Self Determination Essay
  • Self-Determination Theory Essay
  • Self Determination Theory Essay
  • Compatibility of National Self-Determination with Ideals of Global Justice Essay
  • Self-Determination Strategies for Doctors Who Want to Inspire Their Patients to Exercise Regularly Essay
  • Essay on Discipline vs Determination

Become a StudyMode Member

Sign Up - It's Free