Class 12th Chemistry Project Work - MOHR SALT

 

JAWAHAR NAVODAYA VIDYALAYA 

JETHIAN GAYA 1 

CHEMISTRY 

INVESTIGATORY 

PROJECT 

 

SESSION:-2020-21 

  

  NAME:-OM PRAKASH KUMAR  

  STANDARD:-XII 

  ROLL NO:- 

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CERTIFICATE 

 

This is to certify that OM PRAKASH KUMAR of 

class XII has successfully completed the 

investigatory project on the topic  

“MOHR’S SALT” 

Under my guidance during the year 2020-2021 in 

the partial fulfillment of the chemistry practical 

examination conducted by Central Board Of 

Secondary Education  

(CBSE) 

 

 

 TEACHER’S SIGNATURE       PRINCIPAL SIGNATURE 

ACKNOWLEDGEMENT 

I would like to sincerely and profusely thank my 

Chemistry teacher Mr. Arun Kumar Singh, for his 

able guidance and support in completing my 

Project. 

I would also like to extend my gratitude to the 

Principal for providing me with all the facilities that 

was required. 

Last but not least, I would extend my gratitude 

towards all teaching and Non-teaching Staff of 

JAWAHAR NAVODAYA VIDYALAYA JETHIAN 

and towards my friends who have supported me to 

complete this Project. 

OM PRAKASH KUMAR  

 

TOPIC 

 

MOHR 

SALT 

 

THEORY 

Mohr’s salt or Ammonium ferrous sulfate is the 

inorganic compounds with the Formula 

(NH4)2Fe(SO4)2.6H2O containing two different 

Cations Fe2+ and NH4+. It is classified as a 

a double salt of Ferrous Sulphate and Ammonium 

Sulphate. It is a common laboratory reagent. Like 

the other Ferrous Sulphate Salt, Ferrous 

Ammonium Sulphate dissolves in water to give 

the aqua complex which has octahedral molecular 

geometry. Mohr’s Salt has a molar mass of 

392.21 g/mol and it appears as a blue-green 

solid.  

 

  PREPARATION 

Mohr’s Salt is prepared by dissolving an 

an equimolar mixture of hydrated ferrous sulphate 

and ammonium sulphate in water; containing a 

little of Sulphuric Acid and the Crystallization from 

the solution. On crystallization light green crystals 

of ferrous ammonium; sulphate separate out  

 

Ferrous Sulphate FeSO4.7H2O 

 

Ammonium Sulphate (NH4)2SO4 

 

Mohr's Salt (NH4)2Fe(SO4)2.6H2O 

 

  MATERIAL REQUIRED 

  Apparatus: 

 

Two beakers, china dish, funnel, funnel 

Stand, glass rod, wash bottle, tripod 

Stand, wire gauze, ferrous sulphate 

Crystals, ammonium sulphate crystals, 

Dilute sulphate crystals, dilute 

Sulphuric acid, and ethyl alcohol. 

 

 CHEMICALS 

 

Before coating, a steel sheet or rod is passed 

through Sulphuric acid. This treatment produces 

large quantities of ferrous iron(II) sulphate as a by 

Product. A little more Sulphuric acid may be 

added to ensure that the final solution remains 

Slightly acidic. Since ammonia solution is 

Moderately alkaline, the change from excess 

Sulphuric acid to excess ammonia maybe 

detected either with an indicator eg:- litmus paper, 

or by measuring the pH of the mixture with a pH 

meter 

 

  PREPARATION OF 

STANDARD SOLUTION 

OF MOHAR SALT:- 

 

100ml of the decinormal solution of Mohr's salt is 

prepared by weighing accurately accrual 3.92 0f 

A.R. quality crystals, dissolving in water to which 

40mI of dilute Sulphuric acid had been added (to 

prevent hydrolysis) and making up the solution in 

a standard measuring flask. The solution is 

Well shaken.  

Experimentally, it has been found that the mass 

of Mohr's salt prepared is 8.19 

  

PROCEDURE 

 

 1. Take a clean 250ml beaker, transfer 7g FeSO4 

and 3.5g (NH4)2S04 crystals to it. Add 2.3 ml 

dilute H2SO4 (to prevent hydrolysis) 

 

2. In another beaker boil 20 ml H20 for 5 

minutes (to expand air). 

 

3. Add boiling hot H2O to the content in small 

quantities. Stir until salts have completely 

Dissolved. 

 

4. Filter it and heat the filtrate in a china dish till 

it concentrates on the crystallization point. 

 

5. Place the china dish over the beaker full of 

cold H20, cool it, and collect the crystals. 

OBSERVATIONS 

 

Weight= 18.6g 

Color = Pale green 

RESULT 

  

In analytical chemistry, this salt is preferred over 

other salts of ferrous sulphate for titration 

purposes as it is much less proven to oxidation by 

air to ferric or iron (Ill). The oxidations of 

solutions of ferrous iron(II) is very much 

dependent occurring much more readily at high 

temperature and pH. The ammonium ions make 

solutions of Mohr's salt slightly acidic, which slows 

this oxidation process. It is also used to print in 

print edition coating to extend the life of 

the word version. Also, it had been used in 

medicine, electroplating, and so on. 

HEALTH HAZARDS 

 Inhalation:- 

 

                 Causes irritation to the 

respiratory tract symptoms may include coughing, 

shortness of breath. 

 

 Ingestion:- 

                 Causes irritation to the 

gastrointestinal tract. Symptoms may include 

nausea, vomiting, and diarrhea. Low toxicity in 

small quantities but larger dosages may cause 

nausea, vomiting, diarrhea, and black stool. Pink 

urine discoloration is a strong indicator of iron 

poisoning. Liver damage, coma, and death from 

iron poisoning have been recorded. 

 

 

 Skin contact:- 

                Causes irritation to the skin. 

Symptoms include redness itching and pain 

 

 Eye contact:- 

                  Causes irritation, redness, and  pain 

CONCLUSION 

 

Mohr's salt is named after the German chemist, 

Karl Freidrich Mohr, who made many important 

advances in the methodology of titration in the 

19th century. It is a double salt. A double salt is 

a substance obtained by the combination of two, 

different salts which crystallize together as a 

single substance but ionize as two distinct salts 

when dissolved in water. 

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