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  Determination of HCN

Principle :

Procedure :

Weigh of the samples ( fresh leaf about 20 grams, dry leaf about 5 grams)   and then put in to flask kieldalh add 250 - 300 ml distill water and add  8 ml Chloroform  after that boiling them. Put 8 ml potassium hydroxyt 0.1 N into a 250 ml E - flask and place it on the upper shelf with receive tube dipped in the potassium. When there is 100 ml in the E - flask it OK. 

  Titration with Nitrate silver 0.1 N the colour from white in to chase white colour

  Calculation :

                                        V * 0.005204

                 % HCN =    ----------------------    * 100

                                             Weight

                               V   : ml silver nitrate titration

                    0.005204 : 1 ml silver nitrate equivalent  0.005204 g HCN

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