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Standardization of Potassium Permanganate Solution using Sodium Oxalate: Lab Report, Lab Reports of Quantitative Techniques

Northeastern Illinois University (NEIU)Quantitative Techniques

A lab report detailing an experiment conducted to standardize a 0.02m potassium permanganate (kmno4) solution using sodium oxalate (na2c2o4) as a reference. The report includes the procedure, reagents used, work management, results, and conclusions.

Typology: Lab Reports

Pre 2010

Uploaded on 08/04/2009

koofers-user-wxs 🇺🇸

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Lab #6 (36E-1,2),

TITRATION WITH POTASSIUM PERMANGANATE, PREPARATION OF 0.02M OF POTAS-

SIUM PERMANGANATE, AND STANDARDIZATION OF POTASSIUM PERMANGANATE

SOLUTION

RADU PURTUC

QUANTITATIVE ANALYSIS LAB, CHEM 213

Group # 5

Radu Purtuc

Lavonne Salis

Tunde Tamas

Rafal Krejza

Experiment Start Date: July 12, 2006

Experiment End Date: July 14, 2006

Report Due Date: July 17, 2006

PAGE 1

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Lab #6 (36E-1,2), TITRATION WITH POTASSIUM PERMANGANATE, PREPARATION OF 0.02M OF POTAS- SIUM PERMANGANATE, AND STANDARDIZATION OF POTASSIUM PERMANGANATE SOLUTION RADU PURTUC QUANTITATIVE ANALYSIS LAB, CHEM 213 Group # 5 Radu Purtuc Lavonne Salis Tunde Tamas Rafal Krejza Experiment Start Date: July 12, 2006 Experiment End Date: July 14, 2006 Report Due Date: July 17, 2006

ANALYSIS

The purpose of this experiment was to accomplish standardization titration of Potassium Permanganate against Sodium Oxalate solution of known concentration. This is an oxidation reduction reaction, thus there was no need for special indicators. PROCEDURE Clean and dry four Erlenmeyer flasks, four Burettes, two 200 mL beakers, and two 500 mL beakers, a spatula, and a glass rod. Record Lot Number of compounds used in this experiment: 0.02M KMnO4 Lot# 36M H2SO4 Lot# 2876 Na2C2O4 Lot#

** note “Ф” is the equivalent of a mole.

Part A Preparation of Solutions

1. 1.0M H2SO4: mix 30.00 mL of 36M H2SO4 in 970.00 mL diH2O. M1V1=M2V2, final volume

1000mL

2. Na2C2O4 solution: dissolve 0.1340g Na2C2O4 in 250mL 1.0M H2SO

3. 0.02M KMnO4 solution: dissolve 0.7902g KMnO4 in 250mL diH2O, stir well to dissolve until no

visible particles settle at the bottom of flask

4. Blank solution: titrate 250.00 mL of 1.0M H2SO4 with KMnO4,

endpoint reached within 1 drop = 0.05 mL. Final volumes corrected against blank as noted Part B Standardization of 0.02M KMnO4 against Na2C2SO4 solution of known concentration

1. Weighed 0.7902g KMnO4 and mixed with 250 mL of diH2O to give 0.02M KMnO

2. Weighed 0.1340g Na2C2O4 and mixed it with 250.00 mL 1.0M H2SO

3. Heated the solution to 80-90°C, then removed it from heat-plate and proceeded with titration

4. Titrated solution with KMnO4 of known exact molarity until solution reached endpoint (colorless to

pink)

5. The final volumes were corrected against blank (-0.05mL)

REAGENTS

0.02M KMnO 35 M H2SO4 Lot# 2876 Na2C2O Distilled H2O WORK MANAGEMENT Radu was the group leader for this experiment. Tunde, Lavonne, and Rafal alternated between tasks so that one does a measurement while the other visually checked the results to ensure work efficiency while keeping determinant error to its lowest possible value. Rafal weighed Na2C2O4 while Radu watched for

Table 1 : Titrant volumes and molar concentration of KMnO Analyst Mass KMnO (g) Mass Na2C2O (g) Volume (mL) KMnO Blank Adjustment ( - 0.05 mL ) Molarity KMnO (M) Radu 0.7902 0.1340 19.60 19.55 0. Rafal 0.7902 0.1340 19.20 19.15 0. Lavonne 0.7902 0.1340 19.90 19.85 0. Tunde 0.7902 0.1340 19.60 19.55 0. Mean 19.53 0. Standard Dev 0.29 0. RSD % 1.48 1.

Mean Molarity = Σ xi / N = (0.0203 + 0.0207+ 0.0200+ 0.0203) / 4 = 0.0203 (±0.0003)

Standard deviation (s) = √(Σ( xi - )^2 / N-1) = 0.

RSD = (s) / Mean x100 = [0.0003/0.0203] x 100 = 1.78 %

CONCLUSIONS

The experiment calculated what was the actual molarity of the stock 0.02M KMnO4. Following a number

of titrations, mass measurements, an exact standard molarity was determined as 0.0203 (±0.0003).

Possible errors are as follows: Instrument errors: Calibration of scales and volumetric ware (graduated cylinders). Method errors: Not delivering the entire amount of crystals measured into flasks. Personal errors: Reading of the meniscus in graduated cylinders.