57 LABORATORY REPORT CHM 153 NAME DATE SPECTROPHOTOMETRIC DETERMINATION OF AN EQ

Question

57 LABORATORY REPORT CHM 153 NAME DATE SPECTROPHOTOMETRIC DETERMINATION OF AN EQUILIBRIUM CONSTANT cont. Post-lab questions: 1) From LeChatelier's Principle, we know that when a system at equilibrium is disturbed, it will adjust itself so that equilibrium is restored. In this experiment, we disturbed the equilibrium by increasing the concentration of thiocyanic acid (HSCN). a) How should the equilibrium adjust itself? Shift towards product (make more product)? Shift towards reactant (make more reactant)? Briefly explain your reasoning b) Bas consistent with LeChatelier's Principle? That is, did you see more, less, or the amount of complex as you increased the amount of thiocyanic acid? ed on the concentrations of the complex (FeSCN2), are your experimental results same

Explanation / Answer

Fe3+ (aq.) + SCN- (aq.) <-------------> [Fe(SCN)]2+ (aq.)

According to Lechatlier's principle additon of reactants or removal of products shifts the equilibrium towards right side.

Hence,

(a) Addition HSCN increases the concentration of reactants and hence shifts the equilibirum towards right side.

That means more amount of product can be formed.

(b)

Yes. We would observe the more amount of complex is formed in the reaction by the increasing of amount of thiocyanic acid.

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