Dissolve Acidic/neutral sulfide basic sulfide sulfoacid salt Acidic/neutral sulfide base oxysalt+ sulfoacid salt As2S3+3Na2S→2 NasAs3 AS2S3+6OH'-AsO3 +AsS3+3H20 As2Ss+ 3Na2S-2Na3ASS4 4AS2S5+240H3AsO4+5AsS4 +12H,O 第11页 2006-02-22第 11 页 2006-02-22 11 Bi2S3 – – Dissolve – – Acidic/neutral sulfide + basic sulfide → sulfoacid salt Acidic/neutral sulfide + base → oxysalt + sulfoacid salt As2S3 + 3Na2S →2Na3AsS3 As2S3+6OH- →AsO3 3-+AsS3 3-+3H2O As2S5 + 3Na2S →2Na3AsS4 4As2S5+24OH- →3AsO4 3-+5AsS4 3-+12H2O