Question

Determination of chlorine in water by mohers method in hindi

Answer 1

Safety Lab coats, safety glasses and enclosed footwear must be worn at all times in the laboratory. The chromate solution needs to be prepared and used with care as chromate is a known carcinogen. Silver nitrate solution causes staining of skin and fabric (chemical burns). Any spills should be rinsed with water immediately. Introduction Solutions Needed Silver nitrate solution: (0.1 mol L−1) If possible, dry 5 g of AgNO3 for 2 hours at 100°C and allow to cool. Accurately weigh about 4.25 g of solid AgNO3 and dissolve it in 250 mL of distilled water in a conical flask. Store the solution in a brown bottle. Potassium chromate indicator solution: (approximately 0.25 molL-1) Dissolve 1 g of K2CrO4 in 20 mL distilled Determination of Chloride Ion C water. This method determines the chloride ion concentration of a solution by titration with silver nitrate. As the silver nitrate solution is slowly added, a precipitate of silver chloride forms. Ag+(aq) + Cl–(aq) → AgCl(s) The end point of the titration occurs when all the chloride ions are precipitated. Then additional silver ions react with the chromate ions of the indicator, potassium chromate, to form a red-brown precipitate of silver chromate. 2 Ag+(aq) + CrO42–(aq) → Ag2CrO4(s) This method can be used to determine the chloride ion concentration of water samples from many sources such as seawater, stream water, river water and estuary water. Seawater is used as the example here. The pH of the sample solutions should be between 6.5 and 10. (Refer to the additional notes (3) for the explanation). If the solutions are acidic, the gravimetric method or Volhard’s method should be used. Equipment Needed burette and stand 10 and 20 mL pipettes 100 mL volumetric flask 250 mL conical flasks 10 mL and 100 mL measuring cylinders

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