Mohrs salt solution and determine the strength of the. Mohrs salt as a wide coverage testing material for analytical. Preparation of 250 ml of m 20 solution of mohrs salt theory apparatus watch glass, weight box, fractional weight box, 250 ml beaker, glass rod, 250 ml measuring flask and wash bottle. Determination of concentration of kmno4 solution using. Calculation of amount of mohr s salt to be weighed to prepare 100ml m20 solution.
Mohrs salt chemistry science fair project seminar topics. Determine the percentage purity of given sample of mohrs salt, 20 gm of. Preparation of 250 ml of m20 solution of mohrs salt. Chemistry practical class xii to prepare crystals of mohars salt duration. Determination of concentration of kmno4 soution using.
Preparation of 250 ml of n20 solution of mohrs salt chemistry lab manualncert solutions class 12 chemistry sample papers theory apparatus watch glass, weight box, fractional weight box, 250 ml beaker, glass rod, 250 ml measuring flask and wash bottle. Prepare a solution of ferrous ammonium sulphate mohrs salt containing exactly 17. Preparation of ferrous ammonium sulphate cbse chemistry. Preparation of mohrs salt the method of preparing mohrs salt involves the dissolving an equimolar mixture of hydrated ferrous sulfate feso 4 7 h 2 o and ammonium sulfate nh 4 2 so 4 in water. The burette was rinsed with potassium dichromate solution and was filled up to zero mark. Ammonium ironii sulfate, or mohrs salt, is the inorganic compound with the formula.
So, when equimolar proportions of ferrous sulphate and ammonium sulphate are mixed to form a solution and then crystallized, we get crystals of ferrous ammonium salt or mohrs salt. Preparation of 250 ml of n20 solution of mohrs salt. When a mixture containing equimolar proportions of potassium sulphate and aluminium sulphate or ferrous sulphate and ammonium sulphate is crystallised from its solution, a double salt is formed. The ammonium ions make solutions of mohrs salt slightly acidic, which slows this oxidation process. Mohrs salt is also called as double salt which contain more than one simple salt. It undergoes complete dissociation in aqueous solutions. The method described here involves the simple mixing of solutions of feso4. Molecular mass of mohr s salt 392gmole cm 3 of 1m kmno 4 require 392g mohr s salt. Chemistry lab manual 201920 muffakham jah college of. The formation of double salt may be shown as follows.
Mohrs salt is prepared by dissolving an equimolar mixture of hydrated ferrous. Why is it not possible to maintain the concentration of mohrs salt solution after adjusting the ph. Mohrs salt is prepared by dissolving an equimolar mixture of hydrated ferrous sulphate and ammonium sulphate in water. Procedure weigh the clean and dry watch glass and record its weight in the notebook. A double salt is a salt that contains an equimolar mixture of two salts with different cations but same anion. Determination of concentration of kmno4 soution using ferrous ammonium sulphate meity olabs amritacreate.
On crystallization light green crystals of ferrous ammonium. Why is it not possible to maintain the concentration of. For this part of the experiment, you should work in a fumehood. Given solution was prepared by dissolving 4g of ferrous oxalate in dil. Suppose i have prepared initial concentration of 10ppm100 ml.
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