karl - Fisher titratior

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To determine water content for details analoglabs.co.in

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KF TITRATOR:

KF TITRATOR What is the meaning of Karl Fisher titration? Karl Fischer titration  is a classic  titration  method in  analytical chemistry  that uses  coulometric or   volumetric  titration to determine trace amounts of  water  in a sample. It was invented in 1935 by the German chemist  Karl Fischer .

KF TITRATOR:

KF TITRATOR   Principle: The principle of the KF method was discovered by Karl Fischer, an engineer working for I.G. GMBH in Germany in 1935. This method is a volumetric titration of water with Karl Fischer reagent which chemically reacts with water Karl Fischer reagent contains iodine, sulphurdioxide , pyridine and methanol quantitatively reacts with water in the following way.   I 2 + SO 2 + 3C 5 H 5 N 2C 5 H 5 N.HI + C 5 H 5 N.SO 3 CH 3 OH+C 5 H 5 N.SO 3 C 5 H 5 N.SO 4 CH 3 Pyridine is used for the acceleration of the reaction .In the above equations, one mole of iodine reacts with one mole of water. The end point of the KF titration is determined by the constant voltage amperometric method. Commercially available titrant (Karl Fischer reagent) has a factor 4 to 5gm/ml.

KF TITRATOR:

KF TITRATOR

KF TITRATOR:

KF TITRATOR Apparatus used in K.F Titrator: 5OOml reservoir bottle 10/25ml.Burette Cacl 2 tube Moisture trap with rubber bulb for pumping air. Double platinum electrode with banana pins. Rubber tube Delivery tip Titration vessel

KF TITRATOR:

KF TITRATOR Assembling of K.F Apparatus: Place the instrument on a stable platform. Unpack all the glassware, clean with acetone and dry them in an oven. Fill the calcium chloride bulb and moisture trap with calcium chloride. Fix moisture trap in the clamps provided on the right side of the instrument. Place calcium chloride bulb on the burette. Keep KF reservoir in the socket provided on the unit.

KF TITRATOR:

KF TITRATOR Fix the burette on the reservoir, Fit the titration vessel. Insert platinum electrode, KF delivery lid, and sample hold lid and connect the electrode connector. Insert the KF rubber tube and fix back the tube guiding strip with the help of thumb nuts. Insert one end of the tube to the burette and other end to the delivery tip. Place the magnetic stirring capsule in the titration vessel (lift the titration vessel from the unit while inserting magnetic capsule). The assembly of KF titrator is complete.

KF TITRATOR:

KF TITRATOR Operating Procedure: Connect the unit to mains supply and switch ON. Take sufficient amount of methanol in the titration vessel (15ml) to wet the platinum electrode. Take KF reagent in the 500ml. reservoir. Pump the KF reagent by closing the hole of the glass joining tube and pressing the rubber bulb. Open the glass joining tube, once the burette is full. Adjust the magnetic stirrer speed by the speed regulator. Press “START” button. Now the “END” lamp will go off and the “ADD” lamp will glow. The solenoid valve will start operating and the reagent will start falling n to the reaction vessel. Adjust the KF reagent flow by the burette stop cock to get the optimum flow. Automatic titration continues for sometimes (“ADD” lamp indicate the ON and OFF of the K.F reagent flow ”END” lamp will glow at the end of titration. Now the unit is ready for operation.

KF TITRATOR:

KF TITRATOR Moisture Determination: Sodium tartrate dehydrate is primarily standard for KF solution standardization. The primary standard contains 15.6%water, weigh appx.100mg of the sodium tartrate dehydrate crystals and transfer carefully into the titration vessel containing methanol titrated to the end point. Close the sample hole with rubber lid and stir the solution for 2minutes. Note down the burette reading. Press” START” button and start the titration. It takes 2to3 minutes to complete the titration which depends on the moisture content of the sample. On display of “END” lamp take the burette reading.   Calculation of KF factor : : K.F factor F = M * O.1566 mg/ml V   Where M=Weight of the sodium tartrate dehydrate V=Volume of the K.F reagent added.  

KF TITRATOR:

KF TITRATOR The range of K.F factor for most of the solutions ranges from 4 to 5. Add unknown sample of definite quantity into the titration vessel and carryon the titration. Note the end point volume of the K.F reagent. Percent of moisture content of sample :   M.C = K.FVolume in ml*F*100 Weight of sample in mg

KF TITRATOR:

KF TITRATOR K.F Titrator finds application in the following industries Plastic Oil Fats Wood Cotton Paper Explosives Leather Textile Pharmaceuticals Agriculture

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