For the following questions you need to write full sentences that are clear and

Question

For the following questions you need to write full sentences that are clear and unambiguous. That is, we need full responses that clearly show your reasoning. A single word response will equate to no credit. Predict experimental observations for each of the following cases using the lessthanorequalto Chatelier's Principle and your knowledge from Experiment 3. CASE #1 Iron(III)/Thiocyanate equilibrium Fe(H_2O)_6^+3 (aq) + 4 NCS^- (aq) rlarr Fe(NCs)_4(H_2O)_2^-(aq) + 4H_2O (I) light yellow colorless deep red colorless You start with a deep red solution at equilibrium What "stress" will you place on the equilibrium if you add FeCl_3(aq)? How will the reaction respond to the addition of FeCl_3(aq) and what experimental observations can you predict to support your conclusion? What "stress" will you place on the equilibrium if you add NH_4NCS(aq)? How will the reaction respond to the addition of NH_4NCS(aq) and what experimental observations can you predict to support your conclusion?

Explanation / Answer

a)

On addition of FeCl3, more of Fe(H2O)63+ will form. This will shift the equilibrium to the right hand side according to Le Chateliers principle.

b)

When the equilibrium shifts to the right, the deep red solution will persist on application of this stress.

c)

On addition of NH4NCS, more of NCS- ions will be released causing the equilibrium to shift to the right hand side.

d)

When the equilibrium shifts to the right, the deep red solution will persist on application of this stress.

  

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