Anions (Cyanogen, Phosphates & Nitrogen) PDF
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Beni-Suef National University
Basma Hosam Anwar
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Summary
This document presents a chemistry lecture, titled 'Anions', focusing on the cyanogen, phosphate, and nitrogen groups. The lecture details various reactions and tests associated with these groups. Includes dry and wet reactions, and special tests for identification. Suitable for undergraduate chemistry students.
Full Transcript
Anions Presented by: Basma Hosam Anwar Assistant Lecturer in Analytical chemistry department Cyanogen Group SCN , - [Fe(CN)6] , 4- [Fe(CN)6] 3- Name Thiocyanate (SCN-) Ferrocyanide [Fe(CN)6]4- Ferricyanide [Fe(CN)6]3-...
Anions Presented by: Basma Hosam Anwar Assistant Lecturer in Analytical chemistry department Cyanogen Group SCN , - [Fe(CN)6] , 4- [Fe(CN)6] 3- Name Thiocyanate (SCN-) Ferrocyanide [Fe(CN)6]4- Ferricyanide [Fe(CN)6]3- Not applied due to the Not applied due to the Not applied due to the Dry reaction: liberation of toxic gas liberation of toxic gas HCN liberation of toxic gas HCN HCN Wet reaction: 1) S.S + AgNO3 White ppt White ppt Orange ppt solution 2) S.S + FeCl3 Brown color with SnCl2 Blood red color Prussian blue ppt solution give blue ppt 3) Vogal’s test: (For SCN- only) Blue color in ether layer Solid SCN- +SnCl2 + -ve -ve (upper layer) ether + Co(NO3)2 + vigorous shake Phosphate & arsenates Group PO4 , 3- AsO4 , 3- AsO33- Name Phosphate (PO3-4 ) Arsenate (AsO43-) Arsenite (AsO33-) wet reactions: 1) S.S + AgNO3 Yellow ppt Chocolate brown ppt Yellow ppt solution 2) S.S + Magnesia White crystalline White crystalline ppt mix -ve ppt (MgCl2+NH4Cl+NH4OH) 3) Ammonium Yellow ppt on Yellow ppt on boiling -ve molybdate test cold 4) S.S + dil. HCL + H2S -ve -ve Yellow ppt immediately Test for oxidizing property: Test for reducing property: S.S + c. HCl + CHCl3 + 1-2 S.S + NaHCO3 solution + dps Special tests: Ammonium dps of KI solution violet of I2 solution molybdate test color in CHCl3 layer (lower decolorization of brown layer) color of I2 solution Nitrogen Group NO2- Dry Test Powder + dil. HCl weak eff. + brown fumes + pale blue solution Wet Tests 1. S.S + AgNO3 white ppt. 2. S.S + dil. H2SO4 + 1-2 dps of KI solution + CHCl3 violet color in CHCl3 layer (lower layer) Special Test * Brown ring test: S.S + dil. H2SO4 + 1 dp of FeSO4 solution (freshly prepared) on wall brown ring brown solution with Xss FeSO4 solution THANK YOU
