Part C: Determine percent Oxalic Acid in Unknown SampleMolar mass of oxalic acid90.03g/molTrial 1Trial 2Trial 3AveragePrecisionMass of unknown oxalic acid (g)1.00480.99951.0018---Volume (mL) of Standardized KMNO4 usedMoles of KMnO410.039.8510.45---------Moles of oxalic acid (H2C204 • 2H2O)------grams of oxalic acid (H2C204 • 2H2O) (g)percent oxalic acid (%)------Show calculations:

The average value of the parameters is furnished as the sum of the values divided by the total count. Precision furnishes the closeness of the measurement. The reaction between potassium permanganate and oxalic acid is provided as follows: 2KMnO4+3H2SO4+5(COOH)2→K2SO4+ 2MnSO4+ 8H2O+10CO2 Potassium permanganate function as an oxidizing agent and it oxidizes oxalic acid to carbon dioxide. The average value of the mass of oxalic acid (m) is determined as follows: m=(1.0048+0.9995+1.0018) g3=1.0020 g The precision value is observed as 1.0020 g The average value of the volume of KMnO4 (V) is determined as follows: V=(10.03+9.85+10.45) mL3=10.11 mLThe molarity of a substance is furnished as the number of moles of the solute resides per liter of the solution. Let the molarity of the KMnO4 solution is 1.00 M. Calculate the number of moles (nK) of KMnO4 by relating its molarity and its volume. nK= 1.00 mol1000 mL×10.11 mL=0.0101 mol From the balanced equation, two moles of KMnO4 requires five moles of oxalic acid. Calculate the number of moles of oxalic acid (nO)required to react with the given moles of KMnO4. nO=5 mol Oxalic acid2 mol KMnO4×0.0101 mol KMnO4=0.0253 mol The molar mass (MM) of oxalic acid is 90.03 g/mol. The number of moles of a substance is expressed as the ratio of the mass to its molar mass. Relate the moles and the molar mass of the oxalic acid to determine the mass of oxalic acid (mO). mO= 0.0253 mol ×90.03 gmol= 2.27 g So, divide the mass of the oxalic acid into the unknown mass 1.0020 g to obtain the percent of the oxalic acid as Y%. Substitute the exact concentration of the KMnO4 in step 3 to obtain the accurate value of Y. Hence the required parameters of the KMnO4 versus oxalic acid titration is evaluated.

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Chemistry

Part C: Determine percent Oxalic Acid in Unknown Sample Molar mass of oxalic acid 90.03 g/mol Trial 1 Trial 2 Trial 3 Average Precision Mass of unknown oxalic acid (g) Volume (mL) of Standardized KMNO4 used Moles of KMNO4 1.0048 0.9995 1.0018 10.03 9.85 10.45 --- Moles of oxalic acid (H2C2O4 • 2H20) grams of oxalic acid (H2C,O4 • 2H2O) (g) percent oxalic acid (%) --- Show calculations:

Part C: Determine percent Oxalic Acid in Unknown Sample Molar mass of oxalic acid 90.03 g/mol Trial 1 Trial 2 Trial 3 Average Precision Mass of unknown oxalic acid (g) Volume (mL) of Standardized KMNO4 used Moles of KMNO4 1.0048 0.9995 1.0018 10.03 9.85 10.45 --- Moles of oxalic acid (H2C2O4 • 2H20) grams of oxalic acid (H2C,O4 • 2H2O) (g) percent oxalic acid (%) --- Show calculations:

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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