oH<0.5 (H3ASO4/H3ASO3P(I2 oH>1.0 ((H3AsO4/H3AsO3K <12/ ASO3+I OH 2Mn+NaBiO3+14H=2MnO4 +5Bi+5Na +7H2O 4. Salts of arsenic, stibium and bismuth 1) Hydrolysis of chlorides AsCl3+3H20=H3AsO3+3HCI SbCl3+ H20=SbOC1_+2HCI BiCl3+ H2o=BiOCl]+2HCI O3)3, Sb(SO4)3 2)Sulfides and color Oxidation number Substance Ⅲ As2S Sb2s3 BiS C olor orange red black V Colo yellow orange red solubility Sulfide H2o Dilute HCI Strong HCl NaOH/Na2S or (NH4)2S Dissolve Dissolve Sbs Dissolve Dissolve Dissolve Sbs DissolveDissolve Dissolve 第10页 2006-02-22第 10 页 2006-02-22 10 pH<0.5 φø (H3AsO4/H3AsO3)>φø I2/I￾pH>1.0 φø (H3AsO4/H3AsO3)<φø I2/I￾H3AsO4+2I- +2H+ H3 AsO3+I2+H2O 2Mn2++NaBiO3+14H+ =2MnO4 - +5Bi3++5Na+ +7H2O 4. Salts of arsenic, stibium and bismuth 1) Hydrolysis of chlorides AsCl3+3H2O=H3AsO3+3HCl SbCl3+ H2O=SbOCl↓+2HCl BiCl3+ H2O=BiOCl↓+2HCl Sb(NO3)3, Sb(SO4)3 2) Sulfides ○ 1Type and color Oxidation number Substance Ⅲ As2S3 Sb2S3 Bi2S3 Color yellow orange red black Ⅴ As2S5 Sb2S5 Color yellow orange red ○ 2Solubility Sulfide H2O Dilute HCl Strong HCl NaOH Na2S or (NH4)2S As2S3 – – – Dissolve Dissolve As2S5 – – – Dissolve Dissolve Sb2S3 – – Dissolve Dissolve Dissolve Sb2S5 – – Dissolve Dissolve Dissolve H+ OH-