Aqueous ions a level chemistry aqa Questions and Answers

Aqueous ions a level chemistry aqa Questions and Answers Aqueous ion formula for Iron (11) and what colour is it [Fe(H2O)6]2+ (aq) green solution Aqueous ion formula for copper (11) what colour is it [Cu(H2O)6]2+ blue solution Aqueous ion Iron (111) and what colour is it [Fe(H2O)6]3+ (aq) purple solution may look yellow-brown due to [Fe(H2O)5(OH)]2+ Aqueous ion Aluminium (111) and what colour is it [Al(H2O)6]3+(aq) colourless solution Iron (11) aqueous ion plus NaOH makes what? Colour? [Fe(H2O)6]2+ + NaOH ——- [Fe(H2O)4(OH)2] (s) +2H2O forms a green ppt but can go brown when exposed to air at the surface Iron (11) aqueous plus excess NaOH [Fe(H2O)6]2+ + NaOH (aq) excess —- no further change so [Fe(H2O)4(OH)2](s) + 2H2O Iron (II) plus NH3 (aq) colour change [Fe(H2O)6]2+ 2NH3 (aq) —— [Fe(H2O)4(OH)2] (s) + 2NH4+ green ppt can go brown if exposed to air at the surface Iron (11) plus excess NH3 No further change just goes to [Fe(H2O)4(OH)2] (s) + 2NH4+ Iron (11) plus Na2CO3 (aq) [Fe(H2O)6]2+ +Na2CO3 ——— FeCO3 (s) + 6H2O green ppt forms Copper (11) plus NaOH? Colour change? [Cu(H2O)6]2+ + 2NaOH ——- [Cu(H2O)4(OH)2] (s) + 2H2O blue ppt forms Copper (11) plus excess NaOH No further change just [Cu (H2O)4(OH)2] (s) + 2H2O blue ppt Copper (11) plus NH3 (aq)? colour change? [Cu(H2O)6]2+ 2NH3(aq) ——— [Cu(H2O)4(OH)2] (s) + 2NH4+ blue ppt Copper (11) plus excess NH3 (aq)? Colour change? [Cu(H2O)6]2+ (aq) + NH3 (aq) —- [Cu(H2O)2(NH3)4]2+ (aq) as it undergoes ligand substitution deep blue solution Copper (11) plus Na2CO3 (aq)? Colour change? [Cu(H20)6]2+ + Na2CO3 (aq)—— CuCO3 (s) + 6H2O blue ppt Iron (111) plus NaOH? Colour change? [Fe(H2O)6]3+ (aq) + NaOH —- [Fe(H20)3(OH)3] (s) + 3H2O goes from purple solution to brown ppt ppt may look orange-brown Iron (111) plus excess NaOH No further change just get Fe(H2O)3(OH)3(s) goes from purple solution to brown ppt may look red- brown Iron (111) plus ammonia [Fe(H2O)6]3+ + 3NH3(aq) ——— [Fe(H2O)3(OH)3] (s) + 3NH4+ Goes from a pale purple colour to a a RED-Brown colour and is insoluble in xss Iron (111) plus xss ammonia No further change just get Fe(H2O)3(OH)3(s) goes from purple solution to brown ppt may look red- brown Iron (111) plus Na2CO3 (aq)? Colour change? 2[Fe(H2O)6]3+ + 3Na2CO3(aq) ——2[ Fe(H2O)3(OH)3] (s) + 3H2O + 3CO2 goes from purple to brown ppt (brown ppt may look red-brown) and CO2 is produced Aluminium (111) plus NaOH? Colour change? [Al(H2O)6]3+ + 3NaOH —— [Al(H2O)3(OH)3](s) + 3H2O White ppt, Aluminium (111) plus excess NaOH? Colour change? [Al(OH)3(H2O)3] (s) + NaOH (aq) → Na [Al(H2O)3(OH)4]- (aq) + 3H2O (l) goes from a white PPt to colourless it dissolves in solution Aluminium (111) plus NH3 (aq) ? [Al(H2O)6]3+ 3NH3(aq) —— [Al(H2O)3(OH)3](s) + 3NH4+ ` white PPT forms and insoluble in xss Aluminium (111) plus excess NH3 (aq)? Colour change? No further change just Al(H2O)3(OH)3(s) an insoluble white ppt Aluminium (111) plus Na2CO3 (aq)? Colour change? [Al(H2O)6]3+ 3Na2CO3 —- [Al(H2O)3(OH)3] (s) +3H2O + 3CO2 white ppt and Co2 produced Iron (11) plus chloride/ hydrocholic acid [Fe(H2O)6]2+ + 4Cl- --- [FeCl4]2- + 6H2O Yellow PPt forms from a pale green ppt iron (111) plus Chloriide/ Hydrochloric acid [Fe(H2O)6]3+ + 4Cl- --- [FeCl4]- + 6H2O goes from a purple ppt to a yellow colour copper (11) plus Chloriide/ Hydrochloric acid [Cu(H2O)6] 2+ +4Cl- --- [CuCl4]2- + 6H2O goes from a blue colour to a green colour aluminium (11) lus chloride/ Hydrochloric acid [Al(H2O)6]3+ +4Cl- ---- [AlCl4]- +6H20 colourless to colourless ppt