Give the principle involved in the estimation of halogen in an organic compound by Carius method.

Give the principle involved in the estimation of halogen in an organic

1.	Give the principle involved in the estimation of halogen in an organic compound by Carius method.
Answer» Solution :Estimation of halogens: Carins method (i) A KNOWN mass of the organic compound is HEATED with fuming `HNO_(3)` and `AgNO_(3)` (ii) C, H and S gets oxidised to `CO_(2)` , `H_(2)O` and `So_(2)` and halogen combines with `AgNO_(3)` to form a precipitate of silver halide `X overset("Fuming"HNO_(3))underset(AgNO_(3))rarrAgXdarr` (iii) The precipitate AgX is FILTERED washed, dried and weighed. (iv) From the mass of AgX and the mass of organic compound taken, the percentage of halogens are calculated. (v) `% "of chlorine"=(35.5)/(143.5) xx ("WT. % of chlorine")/("wt. of organic compound") xx 100` `% "of Bromine"=(80)/(188) xx ("wt. % of bromine")/("wt. of organic compound") xx 100` `% "of Iodine"=(127)/(235) xx ("wt. % of iodine")/("wt. of organic compound") xx 100`