download ISC Practical Chemistry Volume 2 For Class XII by S P Sharma And Dr Ajaya Baboo PDF Online. ISBN from SChand Publications. Ch: Colloids, Chemical Kinetics, Thermochemical Measurement, Electrochemistry, Chromatography, Titrimetric Analysis (Redox Rxn), Systematic Qualitative. Chemistry Practical Class 12 - List of chemistry practical experiment for class 12th examination is provided here. Mohr's Salt and Solution of Oxalic Acid.
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Like this document? Why not share! It can be prepared by making equimolar solution of hydrated ferrous sulphate and ammonium sulphate in minimum amount of water. A few ml of dil. Cooling of the hot saturated solution yields light green crystals of Mohrs salt.
Al2 SO4 3. It can be prepared by making equimolar solution of potassium sulphate and aluminium sulphate in minimum amount of water.
Cooling of the hot saturated solution yields colourless crystals of Potash alum.
Moisture adsorbed on this Whatman filter paper acts as stationary phase and the solvent acts as the mobile phase. The mixture to be separated is spotted at one end of the paper. This paper is then developed in a particular solvent by placing the paper in a gas jar, taking care that the spot is above the solvent. The solvent rises due to capillary action and the components get separated out as they rise up with the solvent at different rates. The developed paper is called a chromatogram.
Rf retention factor values are then calculated, which is the ratio of the distance moved by the component to the distance moved by the solvent front. Unsaturation present in the organic compound. Shake well. Cool and pour into 15ml of Na2CO3 solution. Smell the contents. Phenolic OH group present. A violet colouration is obtained. H2SO4 A deep blue or green colouration is obtained which turns red on the addition of water.
Add a few drops of distilled water to dissolve the oxalic acid. Make up the volume to the required level using distilled water. The standard solution is prepared. X The reaction between KMnO4 and oxalic acid is a redox reaction and the titration is therefore called a redox titration.
Oxalic acid is the reducing agent and KMnO4 is the oxidizing agent. KMnO4 acts as an oxidizing agent in all the mediums; i. KMnO4 acts as the strongest oxidizing agent in the acidic medium and therefore dil. H2SO4 is added to the conical flask before starting the titration. The titration between oxalic acid and KMnO4 is a slow reaction, therefore heat the oxalic acid solution to about C to increase the rate of the reaction.
Reduction Half: Fill the burette with KMnO4 solution. Pipette out 10ml. Add half a test tube of dil. H2SO4 and heat the solution to about C to increase the rate of the reaction.
Keep a glazed tile under the burette and place the conical flask on it. Note down the initial reading of the burette. Run down the KMnO4 solution into the conical flask drop wise with shaking. Stop the titration when a permanent pink colour is obtained in the solution. This is the end point. Note down the final burette reading. Repeat the experiment until three concordant values are obtained.
NH4 2SO4. It is a primary standard. Add Mohrs salt in small amounts to the weighing bottle, so that the pans are balanced. Using a funnel, transfer the Mohrs salt to the volumetric flask. Add about 5ml. The reaction between KMnO4 and Mohrs salt is a redox reaction and the titration is therefore called a redox titration.
Mohrs salt is the reducing agent and KMnO4 is the oxidizing agent. To prepare a colloidal sol of starch. Starch forms a lyophilic sol with water which is the dispersion medium. The sol of starch can be prepared by water to about C.
The sol is quite stable and is not affected by the presence of an electrolytic impurity. Add a thin paste of starch to water with stirring. To prepare a colloidal sol of ferric hydroxide. Ferric hydroxide forms a lyophobic sol with water which is the dispersion medium. It is prepared by the hydrolysis of ferric chloride with boiling distilled water as per the reaction: The HCl formed during the reaction tries to destabilize the sol and therefore should be removed from the sol by dialysis.
A wine red sol of ferric hydroxide is obtained. Add the solution of FeCl3 to water with stirring. To prepare crystals of Mohrs salt. Mohrs salt i. It can be prepared by making equimolar solution of hydrated ferrous sulphate and ammonium sulphate in minimum amount of water.
A few ml of dil. Cooling of the hot saturated solution yields light green crystals of Mohrs salt. Light green Shape of the crystals: To prepare crystals of Potash alum. Potash alum, a double salt, commonly known as fitkari has the formula K2SO4. Al2 SO4 3.
It can be prepared by making equimolar solution of potassium sulphate and aluminium sulphate in minimum amount of water.