0 m nh3 aqueous solution aqueous ag aq 2 nh 3 aq agbr

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Unformatted text preview: Soln. White precipitate Yellow precipitate Colorless Soln. Colorless Soln. Pale yellow precipitate Black precipitate Exercise: Exercise: Calculate the solubility of AgCl in 1.0 M NH3 aqueous solution. aqueous Ag + (aq) + 2 NH 3 (aq) AgBr ( s ) [ Ag ( NH 3 ) 2 ]+ (aq ) K f Ag + (aq ) + Br − (aq ) AgBr ( s ) + 2 NH 3 (aq ) K sp [ Ag ( NH 3 ) 2 ]+ (aq ) + Br − (aq ) [ Ag ( NH 3 ) 2 ]+ [Cl − ] [ Ag + ] K= ⋅ 2 [ NH 3 ] [ Ag + ] [ Ag ( NH 3 ) 2 ]+ [Cl − ] ⋅ [ Ag + ] = [ NH 3 ]2 ⋅ [ Ag + ] = K f ⋅ K sp = (1.7 × 107 ) × (1.8 × 10−13 ) = 3.1× 10−6 Exercise: Exercise: Calculate the solubility of AgCl in 1.0 M NH3 aqueous solution. aqueous Ag + (aq ) + 2CN − (aq) Ag 2 S ( s ) [ Ag (CN ) 2 ]− (aq ) K f 2 Ag + (aq ) + S 2− (aq ) Ag 2 S ( s ) + 4CN − (aq ) 2[ Ag (CN ) 2 ]− (aq ) + S 2− (aq ) ([ Ag (CN ) 2 ]− ) 2 [ S 2− ] [ Ag + ]2 K= ⋅ −4 [CN ] [ Ag + ]2 ([ Ag (CN ) 2 ]+ ) 2 [ S 2− ] ⋅ [ Ag + ]2 = [CN − ]2 ⋅ [ Ag + ]2 = K f 2 ⋅ K sp = (1.0 × 1021 ) 2 × (6.0 × 10−51 ) = 6.0 × 10−9 K sp Amphoterism Many metal hydroxides and metal oxides are insoluble in neutral metal metal water, but they are soluble in both strong acid and strong base soln. soluble in strong strong Some metal hydroxides and metal oxides of Al3+, Cr2+, metal metal Al Zn2+, Sn2+ are behaving as either acids or bases Hydrated metal ion water AlCl3 ( s ) Al 3+ ( aq )[ Al ( H 2O )63+ ( aq )] + 3Cl − (aq ) → strong base Al (OH )3 ( s ) ↓ → strong base Al (OH ) − (aq ) → 4 Amphoterism Al ( H 2O)63+ (aq ) + OH _ (aq ) Al ( H 2O )5 (OH ) 2+ (aq ) + OH _ (aq ) Al ( H 2O ) 4 (OH ) 2 + (aq ) + OH _ (aq ) Al ( H 2O )3 (OH )3 ( s ) + OH _ (aq ) Al ( H 2O )5 (OH ) 2+ ( a...
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