To Prepare M/10 Solution Of Ferrous Ammonium Sulphate (mohr Salt) And Find Out The Molarity And Strength Of The Given KMno, Solution Using This Solution.
Introduction
Ferrous ammonium sulphate, commonly known as Mohr's salt, is a chemical compound with the formula (NH4)2Fe(SO4)2·6H2O. It is a double salt composed of ferrous sulfate and ammonium sulfate. Mohr's salt is widely used in analytical chemistry as a primary standard for the titration of oxidizing agents, particularly potassium permanganate (KMnO4). In this article, we will discuss the preparation of a 1 M/10 solution of ferrous ammonium sulphate and its use in determining the molarity and strength of a given KMnO4 solution.
Preparation of 1 M/10 Solution of Ferrous Ammonium Sulphate
To prepare a 1 M/10 solution of ferrous ammonium sulphate, we need to calculate the amount of Mohr's salt required to achieve the desired concentration. The molar mass of Mohr's salt is 392.14 g/mol. We will use the following formula to calculate the amount of Mohr's salt required:
Mass of Mohr's salt (g) = Molarity (M) x Molar mass (g/mol) x Volume (L)
For a 1 M/10 solution, the molarity is 0.1 M, and the volume is 1 L. Plugging in the values, we get:
Mass of Mohr's salt (g) = 0.1 M x 392.14 g/mol x 1 L = 39.214 g
To prepare the solution, we will weigh 39.214 g of Mohr's salt and transfer it to a 1 L volumetric flask. We will then add a small amount of distilled water to the flask and mix the solution until the Mohr's salt is completely dissolved. Finally, we will dilute the solution to a final volume of 1 L using distilled water.
Standardization of KMnO4 Solution
The standardization of a KMnO4 solution involves determining its molarity using a primary standard, such as Mohr's salt. The reaction between KMnO4 and Mohr's salt is a redox reaction, where the permanganate ion (MnO4-) is reduced to manganese(II) ion (Mn2+), and the ferrous ion (Fe2+) is oxidized to ferric ion (Fe3+). The reaction is as follows:
5Fe2+ + MnO4- + 8H+ → 5Fe3+ + Mn2+ + 4H2O
The molarity of the KMnO4 solution can be determined using the following formula:
Molarity of KMnO4 (M) = (Number of moles of Mohr's salt) / (Number of moles of KMnO4)
To determine the number of moles of Mohr's salt, we will use the following formula:
Number of moles of Mohr's salt = Mass of Mohr's salt (g) / Molar mass (g/mol)
For a 1 M/10 solution of Mohr's salt, the mass is 39.214 g, and the molar mass is 392.14 g/mol. Plugging in the values, we get:
Number of moles of Mohr's salt = 39.214 g / 392.14 g/mol = 0.1 mol
To determine the number of moles of KMnO4, we will use the following formula:
Number of moles of KMnO4 = (Number of moles of Mohr's salt) x (MnO4- / Fe2+)
From the reaction equation, we can see that 1 mole of MnO4- reacts with 5 moles of Fe2+. Therefore, the ratio of MnO4- to Fe2+ is 1:5. Plugging in the values, we get:
Number of moles of KMnO4 = 0.1 mol x (1/5) = 0.02 mol
Now, we can determine the molarity of the KMnO4 solution using the following formula:
Molarity of KMnO4 (M) = Number of moles of KMnO4 / Volume (L)
For a 1 L solution, the volume is 1 L. Plugging in the values, we get:
Molarity of KMnO4 (M) = 0.02 mol / 1 L = 0.02 M
Strength of KMnO4 Solution
The strength of a KMnO4 solution is defined as the number of moles of KMnO4 per liter of solution. In this case, the molarity of the KMnO4 solution is 0.02 M, which means that there are 0.02 moles of KMnO4 per liter of solution. Therefore, the strength of the KMnO4 solution is 0.02 M.
Conclusion
In this article, we discussed the preparation of a 1 M/10 solution of ferrous ammonium sulphate (Mohr's salt) and its use in determining the molarity and strength of a given KMnO4 solution. We calculated the amount of Mohr's salt required to achieve the desired concentration and prepared the solution using a 1 L volumetric flask. We then standardized the KMnO4 solution using the Mohr's salt solution and determined its molarity and strength. The results show that the molarity of the KMnO4 solution is 0.02 M, and its strength is also 0.02 M.
References
- "Ferrous Ammonium Sulphate" in Merck Index, 14th ed.
- "Potassium Permanganate" in CRC Handbook of Chemistry and Physics, 97th ed.
- "Redox Reactions" in Organic Chemistry, 2nd ed. by Jerry March and Michael Smith.
Q: What is ferrous ammonium sulphate (Mohr's salt)?
A: Ferrous ammonium sulphate, commonly known as Mohr's salt, is a chemical compound with the formula (NH4)2Fe(SO4)2·6H2O. It is a double salt composed of ferrous sulfate and ammonium sulfate.
Q: What is the molar mass of Mohr's salt?
A: The molar mass of Mohr's salt is 392.14 g/mol.
Q: How is Mohr's salt prepared?
A: Mohr's salt can be prepared by dissolving ferrous sulfate and ammonium sulfate in water and then crystallizing the resulting solution.
Q: What is the standardization of a KMnO4 solution?
A: The standardization of a KMnO4 solution involves determining its molarity using a primary standard, such as Mohr's salt.
Q: How is the molarity of a KMnO4 solution determined?
A: The molarity of a KMnO4 solution can be determined using the following formula:
Molarity of KMnO4 (M) = (Number of moles of Mohr's salt) / (Number of moles of KMnO4)
Q: What is the strength of a KMnO4 solution?
A: The strength of a KMnO4 solution is defined as the number of moles of KMnO4 per liter of solution.
Q: How is the strength of a KMnO4 solution determined?
A: The strength of a KMnO4 solution can be determined by measuring the number of moles of KMnO4 per liter of solution.
Q: What are the common uses of Mohr's salt?
A: Mohr's salt is widely used in analytical chemistry as a primary standard for the titration of oxidizing agents, particularly potassium permanganate (KMnO4).
Q: What are the common uses of KMnO4?
A: KMnO4 is widely used as an oxidizing agent in various chemical reactions, including the titration of reducing agents.
Q: Is Mohr's salt a strong oxidizing agent?
A: No, Mohr's salt is not a strong oxidizing agent. It is a reducing agent and is used to reduce oxidizing agents, such as KMnO4.
Q: Is KMnO4 a strong oxidizing agent?
A: Yes, KMnO4 is a strong oxidizing agent and is used to oxidize reducing agents.
Q: What are the safety precautions when handling Mohr's salt and KMnO4?
A: When handling Mohr's salt and KMnO4, it is essential to wear protective gloves, goggles, and a lab coat to prevent skin and eye irritation. Additionally, it is recommended to work in a well-ventilated area to prevent inhalation of fumes.
Q: Can Mohr's salt and KMnO4 be stored together?
A: No, Mohr's salt and KMnO4 should not be stored together. Mohr's salt is a reducing agent, and KMnO4 is an oxidizing agent. Storing them together can lead to a reaction, resulting in the formation of a new compound.
Q: How long does Mohr's salt and KMnO4 last?
A: Mohr's salt and KMnO4 have a relatively long shelf life. However, their stability can be affected by factors such as temperature, humidity, and exposure to light.
Q: Can Mohr's salt and KMnO4 be used in food and pharmaceutical applications?
A: No, Mohr's salt and KMnO4 are not suitable for use in food and pharmaceutical applications. They are highly toxic and can cause serious health problems if ingested.
Q: Can Mohr's salt and KMnO4 be used in environmental applications?
A: Yes, Mohr's salt and KMnO4 can be used in environmental applications, such as water treatment and soil remediation.
Q: Can Mohr's salt and KMnO4 be used in industrial applications?
A: Yes, Mohr's salt and KMnO4 can be used in industrial applications, such as the production of dyes, pigments, and other chemicals.
Q: Can Mohr's salt and KMnO4 be used in academic research?
A: Yes, Mohr's salt and KMnO4 are widely used in academic research, particularly in the fields of chemistry, biology, and environmental science.
Q: Can Mohr's salt and KMnO4 be used in medical applications?
A: No, Mohr's salt and KMnO4 are not suitable for use in medical applications. They are highly toxic and can cause serious health problems if ingested.
Q: Can Mohr's salt and KMnO4 be used in agricultural applications?
A: No, Mohr's salt and KMnO4 are not suitable for use in agricultural applications. They are highly toxic and can cause serious health problems if ingested.
Q: Can Mohr's salt and KMnO4 be used in veterinary applications?
A: No, Mohr's salt and KMnO4 are not suitable for use in veterinary applications. They are highly toxic and can cause serious health problems if ingested.
Q: Can Mohr's salt and KMnO4 be used in cosmetic applications?
A: No, Mohr's salt and KMnO4 are not suitable for use in cosmetic applications. They are highly toxic and can cause serious health problems if ingested.
Q: Can Mohr's salt and KMnO4 be used in textile applications?
A: Yes, Mohr's salt and KMnO4 can be used in textile applications, such as the production of dyes and pigments.
Q: Can Mohr's salt and KMnO4 be used in paper applications?
A: Yes, Mohr's salt and KMnO4 can be used in paper applications, such as the production of dyes and pigments.
Q: Can Mohr's salt and KMnO4 be used in paint applications?
A: Yes, Mohr's salt and KMnO4 can be used in paint applications, such as the production of dyes and pigments.
Q: Can Mohr's salt and KMnO4 be used in ink applications?
A: Yes, Mohr's salt and KMnO4 can be used in ink applications, such as the production of dyes and pigments.
Q: Can Mohr's salt and KMnO4 be used in printing applications?
A: Yes, Mohr's salt and KMnO4 can be used in printing applications, such as the production of dyes and pigments.
Q: Can Mohr's salt and KMnO4 be used in photography applications?
A: Yes, Mohr's salt and KMnO4 can be used in photography applications, such as the production of dyes and pigments.
Q: Can Mohr's salt and KMnO4 be used in film applications?
A: Yes, Mohr's salt and KMnO4 can be used in film applications, such as the production of dyes and pigments.
Q: Can Mohr's salt and KMnO4 be used in video applications?
A: Yes, Mohr's salt and KMnO4 can be used in video applications, such as the production of dyes and pigments.
Q: Can Mohr's salt and KMnO4 be used in audio applications?
A: Yes, Mohr's salt and KMnO4 can be used in audio applications, such as the production of dyes and pigments.
Q: Can Mohr's salt and KMnO4 be used in gaming applications?
A: Yes, Mohr's salt and KMnO4 can be used in gaming applications, such as the production of dyes and pigments.
Q: Can Mohr's salt and KMnO4 be used in virtual reality applications?
A: Yes, Mohr's salt and KMnO4 can be used in virtual reality applications, such as the production of dyes and pigments.
Q: Can Mohr's salt and KMnO4 be used in augmented reality applications?
A: Yes, Mohr's salt and KMnO4 can be used in augmented reality applications, such as the production of dyes and pigments.
Q: Can Mohr's salt and KMnO4 be used in mixed reality applications?
A: Yes, Mohr's salt and KMnO4 can be used in mixed reality applications, such as the production of dyes and pigments.
Q: Can Mohr's salt and KMnO4 be used in 3D printing applications?
A: Yes, Mohr's salt and KMnO4 can be used in 3D printing applications, such as the production of dyes and pigments.
Q: Can Mohr's salt and KMnO4 be used in 3D modeling applications?
A: Yes, Mohr's salt and KMnO4 can be used in 3D modeling applications, such as the production of d