The formation constant kf is the equilibrium constant for...

The formation constant, Kf, is the equilibrium constant for the formation of a complex ion and values are typically large (105-1020). Complex ions are composed of a central metal ion bound to one or more ligands. Ligands can be neutral molecules, such as H2O or NH3, or ions like OH− or CN−. Which equation best represents the formation of Fe(CN)63-?

Transcript

00:01 In this question we're going to be looking into the dissociation, that is, we have f .e .h2o 63 plus, that is reacting with scn to form f .e .h2o, 5ncs2 plus and h2o.

00:25 So what we want to determine here is the equilibrium constant, which is kf.

00:30 And this is the concentration of the products divided by the concentration of the reactants and the products that come into the kf expression is this ion that we are forming here and not h2o so we're going to be having the concentration of let's just call this f and this is s and this is let's just call this h so this is going to be the concentration of f divided by the concentration of h multiplied by the concentration of s and all of these are evaluated at equilibrium so the main task here will be to determine the concentrations that we're going to be having at equilibrium so we're going to have the initial and the change and we're going to finally calculate the concentration at equilibrium by adding the initial and the respective changing so for this one the initial concentration is 0 .02 and the initial concentration here is 1 .0 by 10 to the power negative form so before the reaction actually starts we won't be having any of this we are ignoring this part when we are dealing with this concentration so looking at the change if this changes by negative if this changes by 7 .3 by 10 to the power negative 5 it also means that this is also going to change by 7 .3 by 10 to the power negative 5 we are looking at the ratio of moles here one more of each is forming one more of this so looking at the stoichiometric coefficients, that is 1 is to 1.

02:08 If these two change by this factor, it means this is also going to increase by that factor of 7 .3 by 10 to the power negative 5.

02:18 So what we are going to have at equilibrium, this is going to be 7 .3 by 10 to the power negative 5...

Question

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