Transition Metal Ions & Hydroxide Reactions

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Questions and Answers

Solutions of metal aqua ions react as acids with aqueous ______.

sodium hydroxide

______ reacts with NaOH to form a green precipitate.

Cr3+

______ has a violet solution as its metal-aqua ion.

Cr3+

______ forms a blue precipitate when reacted with NaOH.

Cu2+ Signup and view all the answers

______ does not change when excess sodium hydroxide is added.

Mn2+ Signup and view all the answers

______ produces a white precipitate when reacting with NaOH.

Zn2+ Signup and view all the answers

The formula for chromium hydroxide precipitate is ______.

Cr(OH)3(H2O)3 Signup and view all the answers

______ forms a brown precipitate when reacted with hydroxide.

Fe3+ Signup and view all the answers

Cobalt aqua ions in solution appear as a ______ solution.

pink Signup and view all the answers

The precipitate formula for nickel hydroxide is ______.

Ni(OH)2(H2O)4 Signup and view all the answers

[Cr(H2O)6]^{3+} is a violet solution that turns to a ______ precipitate with NH3.

green Signup and view all the answers

The ion [Mn(H2O)6]^{2+} is a pale pink solution that produces a ______ precipitate with NH3.

light brown Signup and view all the answers

[Fe(H2O)6]^{2+} results in a ______ solution before NH3 is added.

green Signup and view all the answers

[Fe(H2O)6]^{3+} is a yellow solution that forms a ______ precipitate upon reaction with NH3.

brown Signup and view all the answers

[Co(H2O)6]^{2+} appears as a pink solution, transforming to a ______ precipitate with NH3.

blue Signup and view all the answers

[Ni(H2O)6]^{2+} solution is green, which turns to a ______ precipitate when mixed with NH3.

green Signup and view all the answers

[Cu(H2O)6]^{2+} starts as a blue solution and produces a ______ precipitate with NH3.

blue Signup and view all the answers

[Zn(H2O)6]^{2+} appears as a colourless solution that leads to a ______ precipitate when NH3 is added.

white Signup and view all the answers

With excess NH3, [Cr(NH3)6]^{3+} forms a ______ solution.

purple Signup and view all the answers

Excess NH3 results in a ______ solution for [Cu(NH3)4(H2O)2]^{2+}.

dark blue Signup and view all the answers

Flashcards

Transition Metal Ion Reactions with Ammonia (NH3)

The addition of ammonia (NH3) to a transition metal ion solution can lead to the formation of precipitates, coordination complexes, and color changes.

Metal-Aqua Complex

The initial solution of a transition metal ion in water usually forms a complex with water molecules. This complex is often represented as [M(H2O)n]x+, where M is the metal, n is the coordination number, and x is the charge.

Coordination Complexes with Ammonia

When ammonia (NH3) is added to a solution of a transition metal ion, it can displace water molecules and form a new coordination complex. The ammonia molecules bind to the metal ion, creating a complex with a different color and solubility.

Precipitate Formation with Ammonia

The addition of a small amount of ammonia to a solution can lead to the formation of a precipitate. The hydroxide ions (OH-) contributed by the ammonia reaction with water cause the precipitation of the metal hydroxide.