Transition Metals and their Chemistry PDF
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This document provides information about reactions of metal aqua ions with sodium hydroxide and ammonia. Examples with equations are given for transition metals.
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Solutions of metal aqua ions react as acids with aqueous sodium hydroxide. Some react further with excess sodium hydroxide. Reactions with NaOH: Transition Metal Metal-aqua ion With OH- With excess OH- Ion Cr3+ Violet solutio...
Solutions of metal aqua ions react as acids with aqueous sodium hydroxide. Some react further with excess sodium hydroxide. Reactions with NaOH: Transition Metal Metal-aqua ion With OH- With excess OH- Ion Cr3+ Violet solution Green precipitate Green solution [Cr(H2O)6]3+ Cr(OH)3(H2O)3 [Cr(OH)6]3- Mn2+ Pale pink solution Light brown No change [Mn(H2O)6]2+ precipitate Mn(OH)2(H2O)4 Fe2+ Green solution Green precipitate No change [Fe(H2O)6]2+ Fe(OH)2(H2O)4 Fe3+ Yellow solution Brown precipitate No change [Fe(H2O)6]3+ Fe(H2O)3(OH)3 Co2+ Pink solution Blue precipitate No change [Co(H2O)6]2+ Co(OH)2(H2O)4 Ni2+ Green solution Green precipitate No change [Ni(H2O)6]2+ Ni(OH)2(H2O)4 Cu2+ Blue solution Blue precipitate No change [Cu(H2O)6]2+ Cu(OH)2(H2O)4 Zn2+ Colourless solution White precipitate Colourless solution [Zn(H2O)6]2+ Zn(H2O)4(OH)2 [Zn(H2O)4(OH)4]2- It is easiest to remember the formulas of the precipitates by remembering that the number of OH substituted is the same as the value of the charge on the initial ion. Example equations: https://bit.ly/pmt-cc https://bit.ly/pmt-edu https://bit.ly/pmt-cc Solutions of metal aqua ions react as acids with aqueous ammonia. Some react further with excess ammonia. Reactions with NH3: Transition Metal Metal-aqua ion With NH3 With excess NH3 Ion Cr3+ Violet solution Green precipitate Purple solution [Cr(H2O)6]3+ Cr(OH)3(H2O)3 [Cr(NH3)6]3+ Mn2+ Pale pink solution Light brown No change [Mn(H2O)6]2+ precipitate Mn(OH)2(H2O)4 Fe2+ Green solution Green precipitate No change [Fe(H2O)6]2+ Fe(OH)2(H2O)4 Fe3+ Yellow solution Brown precipitate No change [Fe(H2O)6]3+ Fe(H2O)3(OH)3 Co2+ Pink solution Blue precipitate Yellow solution [Co(H2O)6]2+ Co(OH)2(H2O)4 [Co(NH3)6]2+ Ni2+ Green solution Green precipitate Blue solution [Ni(H2O)6]2+ Ni(OH)2(H2O)4 [Ni(NH3)6]2+ Cu2+ Blue solution Blue precipitate Dark blue solution [Cu(H2O)6]2+ Cu(OH)2(H2O)4 [Cu(NH3)4(H2O)2]2+ Zn2+ Colourless solution White precipitate Colourless solution [Zn(H2O)6]2+ Zn(OH)2 [Zn(NH3)4]2+ It is easiest to remember the formulas of the precipitates by remembering that the number of OH- substituted is the same as the value of the charge on the initial ion. Example equations: https://bit.ly/pmt-cc https://bit.ly/pmt-edu https://bit.ly/pmt-cc
