Estimation of halogens:   Carius method: A known mass of compound is heated with conc. `HNO_(3)` in
Channel: Doubtnut
Date: 26/04/2020

Estimation of halogens:   Carius method: A known mass of compound is heated with conc. `HNO_(3)` in the pressure of `AgNO_(3)` contained in a hard glass tube known as Carius tube in a furance . C and H are oxidised to `CO_(2)` and `H_(2)O` . The halogen forms the corresponding AgX. It si filtered m dried and weighted . Extimation of sulphur: A known mass of compound is heated with fuming `HNO_(3)` or sodium peroxide `(Na_(2)O_(2))` in the presence of `BaCl_(2)` solution in Carius tube. Sulphur is oxidised to `H_(2)SO_(4)` and percipipated as `BaSO_(4)` .It is filtered , dried and weighed.   Percentage of S   `=("Atomic mass of S")/("Molecular mas of" BaSO_(4)) xx ("Mass of" BaSO_(4) xx 100)/("Mass of compound")`   0.15 gm of an organic compound gave 0.12 gm of silver bromide by the Carius method. Find the percentage of bromine in the compound.