Carius method (halogen and sulfur estimation) (%Halogen = (Atomic mass of X × mass of AgX precipitate) / (Molar mass of AgX × mass of)
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%Halogen = (Atomic mass of X × mass of AgX precipitate) / (Molar mass of AgX × mass of compound) × 100
What each symbol means
| Symbol | What it stands for |
|---|---|
| W | Mass of organic compound (g) |
| A_X | Atomic mass of halogen (Cl=35.5, Br=80, I=127) |
| M_AgX | Molar mass of AgX (AgCl=143.5, AgBr=188, AgI=235) |
| m_AgX | Mass of silver halide precipitate (g) |
When to use this
Compound heated with fuming HNO₃ in sealed thick-walled glass tube (Carius tube) at ~570 K. Complete oxidation of organic matter. Halogen precipitated as AgX; sulfur as BaSO₄.