This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: Stephanie Warner Chem 153 Shidong Chu 4 November 2005 Qualitative Analysis Unknown H Purpose: To identify various ions in an unknown sample through reactions. Balanced Equations: Cation: BiI 3 + 3NaOH Bi(OH) 3 + 3NaI BiI 3 + H 2 O 2H + + 2I- + BiOI BiI 3 + 3NH 3 + 3H 2 O Bi(OH) 3 + 3NH 4 + 3I- BiI 3 + I- BiI 4 2BiI 3 + 3Na 2 S Bi 2 S 3 + 6NaI Anion: 3Ag + + BiI 3 AgI + Bi 3+ Cl 2 + 2 BiI 3 3I 2 + 2Cl- + 2Bi 3+ Question Set #1: Part 3: Soluble in water clear solution White precipitate in NaOH Clear solution in excess NaOH CuCl 2 No No No CuBr 2 No No No Hg(NO 3 ) 2 No No No SnCl 4 Yes Yes Yes SnCl 4 is present in the unknown. When SnCl 4 is dissolved in water, it dissolves completely to form a clear, colorless solution. When you add NaOH solution to SnCl 4 it produces a white precipitate. This reaction precipitates Sn(OH) 4 . This reaction looks like this: Sn 4+ + 4OH- Sn(OH) 4 Sn(OH) 4 that is produced will quickly dissolve in the excess of NaOH, which will form a...
View Full Document