9C.9

[Rachel Yu 1G]

9C.9. With the help of Table 9C.1 determine the coordination number of the metal ion in each of the following complexes.

a. [NiCl4]2-
b. [Ag(NH3)2]+
c. [PtCl(en)2]2+
d. [Cr(edta)]-

Can someone explain how to get the right coordination numbers for part c and d?

[905416023]

For part c the coordination number is 6 (en is bidentate) and d is also 6 (EDTA is hexadentate)

[Audrie Chan-3B]

To get the correct answer you need to find the coordination number which is essentially the number of atoms bonding to the central metal ion. For c and d, look at the bonding sites for each compound. There are 2 bonding sites in en and 2 en, plus the 2 chlorine atoms, meaning there are 6 atoms attached to the central metal atom. For d, there are 6 bonding sites in edta, so 6 atoms attached to Cr.