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Mohr’s Salt is named after the German chemist Karl Friedrich Mohr, who synthesized it in 1855. In analytical chemistry, Mohr’s salt is frequently used as a primary standard to standardize solutions of other substances, especially when titrating permanganate solutions. In addition, it finds use as a fertilizer in agriculture and various laboratory applications. In this article, we will discuss the various concepts related to Mohr’s Salt.
Table of Content What is Mohr’s Salt?Mohr’s salt, also known as Ferrous Ammonium Sulfate, is a chemical compound with the formula (NH4)2Fe(SO4)2·6H2O. It is a double salt of iron(II) sulfate and ammonium sulfate. The chemical structure shows that it contains two ammonium ions (NH4⁺), one iron(II) ion (Fe²⁺), two sulfate ions (SO4²⁻), and six water molecules (H2O) in its hydrated form.
Structure of Mohr’s Salt – IIT JEEThe Chemical Formula of Mohr’s Salt is (NH4)2Fe(SO4)2·6H2O. On breaking this structure we get,
These components come together with ions to form the complex structure of Mohr’s salt with a monoclinic geometry, that looks like the given below figure.
Formula for Mohr’s Salt
Preparation of Mohr’s SaltMohr’s salt ((NH4)2Fe(SO4)2·6H2O), can be prepared through a reaction between ferrous sulfate (FeSO4) and ammonium sulfate ((NH4)2SO4) in the presence of water. Here’s a simple method for the preparation: Materials Required
Procedure of PreparationThe steps to prepare Mohr’s Salt is mentioned below: Step 1: Calculate the necessary quantities of ammonium and ferrous sulfates. These two compounds have a molar ratio of 1:2. Step 2: Dissolve the measured amount of ferrous sulfate in a suitable volume of distilled water. Stir the solution until the compound is completely dissolved. Step 3: Similarly, dissolve the measured amount of ammonium sulfate in another container with distilled water. Stir until the ammonium sulfate is fully dissolved. Step 4: Now, combine the two solutions into a single container, and stir thoroughly. This mixing will lead to the formation of Mohr’s salt. Step 5: Allow the solution to cool. During cooling, Mohr’s salt will begin to crystallize. The crystals can be separated from the solution through filtration. Step 6: Wash the crystals with a small amount of cold water to remove any impurities. Step 7: Dry the crystals by air-drying. Once dried, Mohr’s salt can be stored in a dry place. Chemical ReactionThe chemical reaction involved in the preparation of Mohr’s Salt is as follows:
Properties of Mohr’s SaltFerrous ammonium sulfate hexahydrate, also known as Mohr’s salt ((NH4)2Fe(SO4)2·6H2O), has several interesting physical and chemical characteristics. The properties of Mohr’s Salt can be understood easily under the following heads below: Physical PropertiesThe physical properties of Mohr’s Salt can be understood by the table below:
Chemical Properties of Mohr’s SaltThe chemical properties of Mohr’s Salt are as follows: 1. Reaction with Alkalis: Mohr’s salt reacts with alkalis to form insoluble hydroxides. For example:
2. Formation of Ferric Salt: Mohr’s salt can be oxidized to form ferric sulfate in the presence of oxidizing agents.
3. Decomposition upon Heating: Mohr’s salt undergoes thermal decomposition upon heating, releasing ammonia, sulfur dioxide, and water vapor.
4. Oxidation by Air: In the presence of air, the iron(II) ions in Mohr’s salt can oxidize to iron(III) ions (Fe³⁺). This oxidation is often observable as a color change from green to brown. Double SaltA double salt is a salt that contains two or more different cations or anions.
Learn, Family of Salts Uses of Mohr’s SaltThe uses of Mohr’s Salt are mentioned below:
Also, Check Mohr’s Salt: Frequently Asked QuestionsWhat is Mohr’s Salt?
What is Mohr’s salt used for?
Is Mohr’s salt a Double Salt?
What happens when Mohr’s Salt is heated?
What is the Crystal Structure of Mohr’s salt?
What is the color of Mohr’s salt?
What is the Chemical Name for Mohr’s salt?
What is the Molar Mass of Mohr’s salt?
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| Class 12 |
Type: | Geek |
Category: | Coding |
Sub Category: | Tutorial |
Uploaded by: | Admin |
Views: | 14 |