An Example Of Primary Standard Compound To Standardize Kmno4 Solution

Question

The following procedure is given for the preparation of a standard solution of potassium permanganate.

The procedure for preparing a standard solution of potassium permanganate using the titration method is given below.

The procedure for preparing a standard solution of potassium permanganate using the titration method is given below.

  • Take 100 ml of distilled water in a volumetric flask.
  • Add 3 gm potassium permanganate crystals to this solution and stir well.
  • After stirring, add 5 ml concentrated sulfuric acid drop wise with constant stirring until you get a purple coloration which persists for at least 30 seconds after adding all the sulfuric acid (do not allow any excess sulfuric acid to remain).

Procedure for preparing a standard solution of potassium permanganate by titration

  • Weigh 5 cm3 of potassium nitrate (KNO3) in a volumetric flask.
  • Add water to the mark and shake well until dissolved, then dilute to volume with distilled water.
  • Transfer this solution into another clean volumetric flask and make up to 100 cm3 with distilled water.

(i) Preparation of sample solution

a) Using a pipette, transfer the required volume of sample solution into a volumetric flask.

b) Make sure you have the correct amount of sample solution in your volumetric flask before proceeding with the next step (i.e., adding KMnO4).

(ii) Preparation of blank solution

In order to prepare the blank solution, you need to follow the following steps:

  • Prepare a volumetric flask and mark it with “Blank”.
  • Put about 10 mL of water into it and mix well.

(iii) Weighing and addition of KNO3 into the volumetric flask (5 cm3 only)

(iii) Weighing and addition of KNO3 into the volumetric flask (5 cm3 only).

  • Weigh 5 g of potassium nitrate and transfer it to a clean dry beaker.
  • Add distilled water until you get a total volume of 100 cm3, which means that you have to add 95 cm3 more than your final volume needed. You can use some extra water if necessary, but do not exceed 105 cm3 in total!

(iv) Weighing the exact amount of KMnO4 required to get a phenolphthalein end point and add into it by dissolving in water. Then transfer the contents of volumetric flask into burette so that the volume in each will be same.

(v) Addition of KMnO4 into the volumetric flask (5 cm3 only). Use a clean, dry beaker to transfer 5 cm3 of the KMnO4 solution.

Takeaway:

  • The procedure is accurate. The solution is standard and stable, so it can be used to prepare other solutions of potassium permanganate by titration
  • The solution should be prepared using the following steps:
  • Weigh out 0.4 g of KMnO4 into an Erlenmeyer flask
  • Add water dropwise until a faint pink color remains when the contents are added to 5% sulfuric acid in another Erlenmeyer flask (this will take about 30 mL).

In conclusion, the procedure for preparing a standard solution of potassium permanganate by titration is given below: Weigh out 0.4 g of KMnO4 into an Erlenmeyer flask Add water dropwise until a faint pink color remains when the contents are added to 5% sulfuric acid in another Erlenmeyer flask (this will take about 30 mL).

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  1. ElizabethAlexander
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    2022-12-26T00:51:23+05:30
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    An Example Of Primary Standard Compound To Standardize Kmno4 Solution

    Introduction

    Kmno4 is a compound that’s used in many industries for a variety of different applications. But what is its standardization process? In this article, we will explore an example of how a primary standard compound is standardized in order to create a normalized solution. By doing so, it becomes easier to compare and contrast different KMno4 solutions.

    What is the Primary Standard Compound?

    Primary standard compound is a chemical compound that is used to standardize the concentration of KMnO4 solution. KMnO4 is a strong acid that can corrode metal. The primary standard compound helps to maintain the precise concentration of KMnO4 solution so that it does not corrode metal.

    How to make a standardized KMNO4 solution using the Primary Standard Compound?

    Standardizing a KMNO4 solution involves using the primary standard compound. The primary standard is a pure substance that has been specifically chosen to be the basis for calibrating other substances. When preparing a KMNO4 solution, it is important to use the primary standard compound because it will ensure that the solution is accurate.

    To make a standardized KMNO4 solution, you will need the primary standard compound, distilled water, and potassium iodide. To prepare the solution, dissolve 1 gram of the primary standard in 10 liters of distilled water. Next, add 1 teaspoon of potassium iodide to each liter of solution. Finally, heat the mixture until it reaches boiling point. Let it cool before using it to standardize a KMNO4 solution.

    Conclusion

    In chemistry, a primary standard is a substance whose relative concentration can be measured with precision. A common example of a primary standard is water: its volume can be accurately determined using the Litmus Test, and so it can serve as an accurate reference for measuring other chemicals. In physical chemistry, primary standards are also used to calibrate analytical instruments.

  2. Joyce
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    2023-04-01T02:12:54+05:30
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    An Example Of Primary Standard Compound To Standardize Kmno4 Solution

    The goal of this lab is to master the technique of standardizing KClO4 solution with primary standard compound. The procedure below describes how to do this using a single liter flask and graduated cylinder. It is important that each step be completed in order.

    Step 1:

    To begin, you must first know the formula and molar mass of KMnO4. The formula is Kmno4, which means that it contains one potassium ion (K), one manganese(Mn) ion, and four oxygen(O) atoms per molecule.

    The molar mass is 84.98 grams per mole (g/mol). In other words, if you have 100mL of a solution containing this compound and want to find out how much it weighs, then you can multiply your answer by 100mL times 84.98g/mol = 84980g

    Step 2:

    Next, weigh out a known amount of standard solution. Weighing the entire container of KMNO4 would be too heavy to carry around and would be difficult to dissolve in water anyway. Instead, use a separate volumetric flask that’s been labeled with its mass (in grams) and volume (in milliliters). The equation for calculating how much KMNO4 is present in this particular standard solution is:

    Mass of Kmno4 = Mass of Standard Solution x Volume Of Standard Solution / Mass Of Deionized Water Used To Dissolve It

    Step 3:

    Step 3: Add 50 mL of HCl to the standard solution. Mix well, and observe the color change. Record the color change in your data table.

    Takeaway:

    You can now use the standard compound to make a solution of known concentration.

    In this example, you want to make a solution with a [KNO3] of 1.00 M. In order to do that, you need to add enough NaOH so that the resulting pH is exactly 12 (since this is what we know from our previous calculations). The equation below shows how much NaOH we need:

    This is a simple example of how to standardize a solution. We hope that it helps you understand the process better and will help you in your own experiments!

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