Dilute q Strong hci HNO3 HCI regla Pbs Ag2S IA ZnS Cds Cus MnS Fes Sns CoS Sb2S3 As2S5 Hg?s JIA NIS Sb,s Bi2S3 NIS >10 10-3-10301030-1030<10 Note IIA: Sparingly soluble 3)Reducing properties 3. Polysulfides 1) Preparation s+(x-1)s= Na2S S-+(x-1)S=Sx2(x:2-6) x↑ color↑ yellow→ orangish yellow-red 2)Properties d Instability: S2 2+2H=H2S2- H2S+SI 6 Oxidizing/reducing properties Oxidizing properties SnCl2 $- SnS, S2- SnS3 Reducing properties 4FeS2(pyrite)+ 1102=2Fe2O3+ 8S0 Application Section Five Oxyacids and Oxysalts of Sulfur 1. Sulfurous acid and sulfites 第16页 2006-02-22第 16 页 2006-02-22 16 Dilute HCl Strong HCl HNO3 Aqua regia ⅠA NH4 + ⅡA* ZnS MnS FeS CoS* NiS* PbS CdS SnS SnS2 Sb2S3 Sb2S5 Bi2S3 Ag2S CuS Cu2S As2S3 As2S5 CoS NiS HgS Hg2S Al2S3 Cr2S3 Ksp θ >10-24 10-25~10-30 10-30~10-50 <10-50 Note A Ⅱ * : Sparingly soluble 3) Reducing properties 3. Polysulfides 1) Preparation: Na2S + (x-1)S = Na2Sx S2- + (x-1)S = Sx 2- (x:2~6) x↑ color↑ yellow → orangish yellow→ red 2) Properties ○ 1 Instability: S2 2- + 2H+ = H2S2 → H2S+S↓ ○ 2 Oxidizing/reducing properties Oxidizing properties: SnCl2 S2- SnS↓ 2− 2 S SnS3 2- Reducing properties 4FeS2 (pyrite) + 11O2 = 2Fe2O3 + 8SO2 2) Application 3) Section Five Oxyacids and Oxysalts of Sulfur 1. Sulfurous acid and sulfites