Transition metals form complex ions with a variety of species. These complex ion

Question

Transition metals form complex ions with a variety of species. These complex ions are generally soluble in water and brightly colored and therefore able to be observed easily. For example when nickel(II) nitrate is dissolved in water, the nickel(II) ion becomes hydrated. Nickel(II) ion also forms a complex ion with four CN1- ions, as shown in the following equilibrium equation.

                                   Ni2+(aq)      +     4 CN1-(aq)      ?     [Ni(CN)4]2-(aq)      +     6 H2O

                                green                                                   orange

State the effect of each of the following on the above equilibrium mixture. What will you see?

A. NaCN )

B. Na2CO3 (consider the reaction with carbonate ion with nickle (II).)

C.AgNO3(consider the reaction of the silver ion with cyanide ion.)

D.Put the reaction in boiling water, assume it is endothermic.

Explanation / Answer

A- [Ni(CN)4]2- react with CN- to produce red [Ni(CN)5]3-

B- [Ni(CN)4]2-react with CO3^2- formed green gel ppt NiCO3+Ni(OH)2

C-[Ni(CN)4]2- react with AgNO3 formed [Ag(CN)2]-

D-when boiled with water [Ni(H2O)6]2+formed

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