Online Tution   »   Important Question   »   Mohr's Salt

Mohr’s salt- Formula, Name, Structure, Molecular Mass

Mohr’s Salt Formula

Mohr’s salt is an inorganic compound whose chemical formula is represented as Fe (SO4) (NH4)2 (SO4). Mohr’s salt is ammonium iron sulfate. Mohr’s salt contains two primary cations one is an ammonium cation and the other is a ferrous cation. This shows that Mohr’s salt can be categorized as a double salt of ammonium sulfate and ferrous sulfate. Mohr’s salt is easy to keep in laboratories in the form of crystals because it is resistant to oxidation.

Mohr’s Salt Name

Mohr’s salt is name of ammonium iron sulfate.


Mohr’s Salt Structure

Mohr’s salt is easy to keep in laboratories in the form of crystals because it is resistant to oxidation.

What is Mohr’s salt?

Mohr’s salt is prepared by dissolving ammonium sulfate and hydrating ferrous sulfate in water which contains a small amount of sulphuric acid. The solution is then subjected to crystallization to obtain crystals of Mohr’s soul which are light green. The salt undergoes ionization and releases all the cations and anions present in it when it is heated there are some common impurities in Mohr’s salt which include nickel, zinc, lead, magnesium, and manganese. To prevent the hydrolysis of ferrous sulfate, dilute sulphuric acid is added to the solution. To prevent the conversion of fe2+ ions into fe3+ ions the excessive heating of the salt solution is avoided. If the solution turns yellow then the process must be repeated repeat process and attain the light green color of the crystals. If the crystals do not separate after cooling, a few crystals of Mohr’s salt can be added to the concentrated solution to promote the growth of crystals this is generally called ‘seeding’.


Properties of Mohr’s salt

  • The molar mass of Mohr’s salt is 284.05 grams per mole. The hexahydrate of Mohr’s salt has a molar mass of 392.13 grams per mole.
  • The density of Mohr’s salt is 1.86 grams per cubic centimeter in standard conditions.
  • The physical state of Mohr’s salt is crystalline solids which are bluish-green
  • Solubility of Mohr’s salt is 269 grams per liter.


Application of Mohr’s salt

Most salt is the most preferred compound which acts as the source of fe2 ions. Mohr’s salt can be used as solids as the source of the ions. Mohr’s salt is mostly preferred because it has a long shelf life and they’re resistant to oxidation. Oxidation of Mohr’s salt is known to occur quicker when the pH of the environment is high it is important to note that Mohr’s salts are usually acidic which can be explained by the presence of ammonium cations. It can also be noted that sulphuric acid can be added to the solution of Mohr’s salt to prevent the oxidation of ferrous ions to ferric ions. Mohr’s salt is also used in the production of blue iron it is used as a component of iron plating solutions and coloring baths for brass. Mohr’s salt is also used in photography.

Related Post:




FAQs: Mohr’s salt

  1. What is the chemical name of Mohr’s salt?

Ans. The chemical name of more salt is ammonium iron (II) sulfate it is an inorganic compound.

2. What is the preparation of Mohr’s salt?

Ans. The preparation of more salt starts with an equimolar mixture of hydrate ferrous sulfate and ammonium sulfate is dissolved in water containing sulphuric acid and then subjected to the resultant solution to crystallization crystals.

3. What are the advantages of using Mohr’s salt as a source?

Ans. The advantage of using more salt as a source is that it contains a long shelf life and it also resists oxidation due to atmospheric exposure the oxidation of this compound is well known to take place when the pH of the environment is high.

4. What is the formula for anhydrous Mohr’s salt?

Ans. The chemical formula of anhydrous salt is Fe (SO4) (NH4)2 (SO4).

Sharing is caring!

Thank You, Your details have been submitted we will get back to you.
Was this page helpful?

Leave a comment

Your email address will not be published. Required fields are marked *