Shanxian Chemical
SUPPLEMENTS
Determination of Hydrogen Peroxide by Titration with Potassium Permanganate
Determination of hydrogen peroxide by potassium permanganate titration
Abstract
The purpose of this experiment is to explore the method for the determination of hydrogen peroxide content by potassium permanganate titration. Through accurate experimental operation and data processing, the principle, steps and precautions of this method are expounded to achieve accurate determination of hydrogen peroxide content.
I. INTRODUCTION
Hydrogen peroxide, as an important chemical substance, has a wide range of applications in many fields. Accurate determination of its content is of great significance for industrial production, scientific research, etc. The potassium permanganate titration method has become one of the commonly used methods for the determination of hydrogen peroxide content because of its relatively simple operation and accurate results.
II. EXPERIMENTAL PRINCIPLE
In acidic media, hydrogen peroxide can undergo redox reaction with potassium permanganate. The ionic equation of the reaction is: $2MnO_ {4 }^{-} + 5H_ {2} O_ {2} + 6H ^{+} = 2 Mn ^ {2 + } + 5O_ {2} ↑ + 8H_ {2} O $. The content of hydrogen peroxide can be calculated according to the dosage of potassium permanganate standard solution and the stoichiometric relationship of the reaction.
III. Experimental instruments and reagents
1. ** Instruments **: acid burette, conical bottle, pipette, volumetric bottle, analytical balance, measuring cylinder, etc.
2. ** Reagent **: potassium permanganate solid (analytically pure), hydrogen peroxide sample, 3mol/L sulfuric acid solution, sodium oxalate solid (reference substance).
IV. Experimental steps
1. ** Preparation and calibration of potassium permanganate standard solution **
- ** Preparation **: accurately weigh a certain amount of potassium permanganate solid, place it in a large beaker, add an appropriate amount of water to dissolve, transfer to a brown volumetric flask, bandwidth evaluation, shake well, and leave it in a dark place for 7-10 days to filter for later use.
- ** Calibration **: Accurately weigh a certain quality of sodium oxalate reference material, place it in a conical bottle, add an appropriate amount of water to dissolve, then add a certain amount of 3mol/L sulfuric acid solution, heat it to 75 - 85 ℃, while it is hot, titrate the potassium permanganate solution to be calibrated until the solution is reddish and does not fade within 30s, record the volume of the consumed potassium permanganate solution, calibrate it 3 times in parallel, and calculate the exact concentration of the potassium permanganate standard solution.
2. ** Determination of hydrogen peroxide content **
- Accurately pipette a certain volume of hydrogen peroxide sample solution into a conical bottle with a pipette, and add an appropriate amount of 3mol/L sulfuric acid solution.
- Put the calibrated potassium permanganate standard solution into an acid burette and adjust the liquid level to 0.00 scale or near.
- Titrate the hydrogen peroxide sample solution with the potassium permanganate standard solution. The titration speed should be slow at the beginning. As the reaction progresses, the reaction speed is accelerated, and the titration speed can be appropriately accelerated. However, it is still necessary to add it dropwise until the solution is reddish and does not fade within 30s, which is the end point. Record the volume of the consumed potassium permanganate solution and measure it in parallel for 3 times.
V. Data recording and processing
1. ** Calibration data records of potassium permanganate standard solution **
| Calibration times | Sodium oxalate mass (g) | Consumption of potassium permanganate solution volume (mL) | Potassium permanganate solution concentration (mol/L) |
| :---: | :---: | :---: | :---: |
| 1 | | | |
| 2 | | | |
| 3 | | | |
Calculate the mean and relative mean deviation of the concentration of potassium permanganate standard solution.
2. ** Hydrogen peroxide content determination data record **
| Determination times | Hydrogen peroxide sample volume (mL) | Consumed potassium permanganate solution volume (mL) | Hydrogen peroxide content (mol/L) |
| :---: | :---: | :---: | :---: |
| 1 | | | |
| 2 | | | |
| 3 | | | |
Calculate the hydrogen peroxide content according to the stoichiometric relationship of the reaction, and calculate the average value and the relative mean deviation.
6. Precautions
1. The potassium permanganate solution is easy to decompose when exposed to light. It should be stored in a brown bottle and needs to be re-calibrated after being placed for a period of time.
2. During the titration process, the temperature should be controlled at 75-85 ° C. If the temperature is too high, hydrogen peroxide will decompose easily. If the temperature is too low, the reaction speed will be slow, and the titration endpoint will not be easy to judge.
3. When starting the titration, the potassium permanganate solution should be added dropwise, because the reaction speed is slow at the beginning. After a certain amount of $Mn ^ {2 +} $is generated, the reaction speed will be accelerated, and the titration speed can be appropriately accelerated. However, it is still necessary to Conclusion: Through this experiment, the determination of hydrogen peroxide content was achieved by using potassium permanganate titration. Under the condition of strictly following the experimental steps, accurately recording the data and reasonably processing, more accurate determination results can be obtained. This method has the advantages of simple operation and high accuracy, and is suitable for the routine determination of hydrogen peroxide content.
Abstract
The purpose of this experiment is to explore the method for the determination of hydrogen peroxide content by potassium permanganate titration. Through accurate experimental operation and data processing, the principle, steps and precautions of this method are expounded to achieve accurate determination of hydrogen peroxide content.
I. INTRODUCTION
Hydrogen peroxide, as an important chemical substance, has a wide range of applications in many fields. Accurate determination of its content is of great significance for industrial production, scientific research, etc. The potassium permanganate titration method has become one of the commonly used methods for the determination of hydrogen peroxide content because of its relatively simple operation and accurate results.
II. EXPERIMENTAL PRINCIPLE
In acidic media, hydrogen peroxide can undergo redox reaction with potassium permanganate. The ionic equation of the reaction is: $2MnO_ {4 }^{-} + 5H_ {2} O_ {2} + 6H ^{+} = 2 Mn ^ {2 + } + 5O_ {2} ↑ + 8H_ {2} O $. The content of hydrogen peroxide can be calculated according to the dosage of potassium permanganate standard solution and the stoichiometric relationship of the reaction.
III. Experimental instruments and reagents
1. ** Instruments **: acid burette, conical bottle, pipette, volumetric bottle, analytical balance, measuring cylinder, etc.
2. ** Reagent **: potassium permanganate solid (analytically pure), hydrogen peroxide sample, 3mol/L sulfuric acid solution, sodium oxalate solid (reference substance).
IV. Experimental steps
1. ** Preparation and calibration of potassium permanganate standard solution **
- ** Preparation **: accurately weigh a certain amount of potassium permanganate solid, place it in a large beaker, add an appropriate amount of water to dissolve, transfer to a brown volumetric flask, bandwidth evaluation, shake well, and leave it in a dark place for 7-10 days to filter for later use.
- ** Calibration **: Accurately weigh a certain quality of sodium oxalate reference material, place it in a conical bottle, add an appropriate amount of water to dissolve, then add a certain amount of 3mol/L sulfuric acid solution, heat it to 75 - 85 ℃, while it is hot, titrate the potassium permanganate solution to be calibrated until the solution is reddish and does not fade within 30s, record the volume of the consumed potassium permanganate solution, calibrate it 3 times in parallel, and calculate the exact concentration of the potassium permanganate standard solution.
2. ** Determination of hydrogen peroxide content **
- Accurately pipette a certain volume of hydrogen peroxide sample solution into a conical bottle with a pipette, and add an appropriate amount of 3mol/L sulfuric acid solution.
- Put the calibrated potassium permanganate standard solution into an acid burette and adjust the liquid level to 0.00 scale or near.
- Titrate the hydrogen peroxide sample solution with the potassium permanganate standard solution. The titration speed should be slow at the beginning. As the reaction progresses, the reaction speed is accelerated, and the titration speed can be appropriately accelerated. However, it is still necessary to add it dropwise until the solution is reddish and does not fade within 30s, which is the end point. Record the volume of the consumed potassium permanganate solution and measure it in parallel for 3 times.
V. Data recording and processing
1. ** Calibration data records of potassium permanganate standard solution **
| Calibration times | Sodium oxalate mass (g) | Consumption of potassium permanganate solution volume (mL) | Potassium permanganate solution concentration (mol/L) |
| :---: | :---: | :---: | :---: |
| 1 | | | |
| 2 | | | |
| 3 | | | |
Calculate the mean and relative mean deviation of the concentration of potassium permanganate standard solution.
2. ** Hydrogen peroxide content determination data record **
| Determination times | Hydrogen peroxide sample volume (mL) | Consumed potassium permanganate solution volume (mL) | Hydrogen peroxide content (mol/L) |
| :---: | :---: | :---: | :---: |
| 1 | | | |
| 2 | | | |
| 3 | | | |
Calculate the hydrogen peroxide content according to the stoichiometric relationship of the reaction, and calculate the average value and the relative mean deviation.
6. Precautions
1. The potassium permanganate solution is easy to decompose when exposed to light. It should be stored in a brown bottle and needs to be re-calibrated after being placed for a period of time.
2. During the titration process, the temperature should be controlled at 75-85 ° C. If the temperature is too high, hydrogen peroxide will decompose easily. If the temperature is too low, the reaction speed will be slow, and the titration endpoint will not be easy to judge.
3. When starting the titration, the potassium permanganate solution should be added dropwise, because the reaction speed is slow at the beginning. After a certain amount of $Mn ^ {2 +} $is generated, the reaction speed will be accelerated, and the titration speed can be appropriately accelerated. However, it is still necessary to Conclusion: Through this experiment, the determination of hydrogen peroxide content was achieved by using potassium permanganate titration. Under the condition of strictly following the experimental steps, accurately recording the data and reasonably processing, more accurate determination results can be obtained. This method has the advantages of simple operation and high accuracy, and is suitable for the routine determination of hydrogen peroxide content.
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