In aqueous solution Cd II exists as 6 coordinate aqua

Last updated: 7/2/2023

In aqueous solution Cd II exists as 6 coordinate aqua complex The solution on treatment with Br ion forms finally 4 coordinate Cd II complex with Br ions successively in four steps with stepwise formation constants logK 1 56 logK 0 54 logK 0 06 and logk 0 37 The higher value of K as compared to K is due to A transformation of trigonal complex into tetrahedral complex B change from octahedral to tetrahedral geometry C increase in AH of the reaction D large increase in the number of particles when fourth Br enters the coordination zone