How to Make Mohr's Salt: Water and Solution Amounts Needed?

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In summary, when making Mohr's Salt, the main problem is calculating the amount of iron, ammonia, and sulfuric acid needed. This can be done by writing the total synthesis reaction and using stoichiometry to determine the amount of each reactant required. Alternatively, one can calculate the number of moles of each component in 1 mole of Mohr's Salt and use that information to determine the necessary amounts. The reaction takes place in water, so there is no issue with the water source. It is important to note that in the given equations, the starting materials are not sulfates, but instead iron and ammonia.
  • #1
jsmith613
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When making Mohr's Salt (Ammonium Iron (II) Sulphate) how much water am I required to add OR how much of each solution must I use.

Thanks

Assuming it is equimolar, how much of each (Iron Sulfate and Ammonium Sulphate) Do i need
 
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  • #2
Start with synthesis reaction equation.
 
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  • #3
Borek said:
Start with synthesis reaction equation.

--

The reactions are:

Fe + H2SO4 --> FeSO4 + H2

NH3 + HSO4 --> (NH4)2SO4

But i know that the FeSO4 should be hydrated (FeSO4-7H2O) - how is this achieved
 
  • #4
Reaction takes place in water, so there is no problem with water source, don't you think?

Main problem is how to calculate amount of iron, ammonia and sulfuric acid. But it is not that difficult. Two possible ways - one, write total reaction of synthesis (that is, but ammonia, iron and sulfuric acid on the left, Mohr's salt on the right) and do simple stoichiometry. Second - how many moles of iron per 1 mole of Mohr's salt? How many moles of ammonia? Of sulfuric acid? Can you use this information to calculate how much of each reactant you will need to produce 1 mole of Mohr's salt?
 
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  • #5
Borek said:
Reaction takes place in water, so there is no problem with water source, don't you think?

Main problem is how to calculate amount of iron, ammonia and sulfuric acid. But it is not that difficult. Two possible ways - one, write total reaction of synthesis (that is, but ammonia, iron and sulfuric acid on the left, Mohr's salt on the right) and do simple stoichiometry. Second - how many moles of iron per 1 mole of Mohr's salt? How many moles of ammonia? Of sulfuric acid? Can you use this information to calculate how much of each reactant you will need to produce 1 mole of Mohr's salt?

Fe + H2SO4 --> FeSO4-6H2O + H2

NH3 + H2SO4 --> (NH4)2SO4

We have 1 mole of Iron in the Iron (II) salt and 1 mole of sulphate
In the Ammonium salt, we have 2 moles of ammonium and one mole of sulphate.

Does that mean we need 1 mole of FeSO4 and 1 mole of (NH4)2SO4
 
  • #6
Yes. But from your equations I got the impression that you start not with sulfates, but with iron and ammonia.
 
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  • #7
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Related to How to Make Mohr's Salt: Water and Solution Amounts Needed?

What is Mohr's Salt?

Mohr's Salt, also known as ferrous ammonium sulfate, is a type of double salt that is commonly used in chemistry experiments and industrial processes. It is a combination of ferrous sulfate and ammonium sulfate, and has the chemical formula FeSO4·(NH4)2SO4·6H2O.

Why is Mohr's Salt commonly used in experiments?

Mohr's Salt is commonly used in experiments because it is relatively inexpensive, readily available, and has a variety of uses. It can be used as a reducing agent, a source of sulfur, and a standard for titration experiments.

How is Mohr's Salt made?

Mohr's Salt is typically made by mixing solutions of ferrous sulfate and ammonium sulfate until the desired ratio is achieved. The resulting solution is then allowed to crystallize, forming the characteristic green crystals of Mohr's Salt.

What precautions should be taken when handling Mohr's Salt?

When handling Mohr's Salt, it is important to wear appropriate personal protective equipment, such as gloves and safety glasses, as it can irritate the skin and eyes. It is also important to avoid inhaling the dust, as it may cause respiratory irritation.

Can Mohr's Salt be substituted with other chemicals?

Mohr's Salt can be substituted with other chemicals, such as ferrous sulfate and ammonium sulfate, but the resulting solution may not have the exact same properties. It is important to consult a reliable source or conduct experiments to determine appropriate substitutions for specific purposes.

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