Question

number 2 please

2. The stock solution at equilibrium used in teat tuba #4 contains Fe"(aq), SCN-(aq) and FeSCNPtaq). When NaOH was added to test iube #4 a slaft in the equilibrium was observed. What chemical species in the stock solution reacted with NEOH Vilite the balanced chemical reaction associated with the change observed from the addition NaOH to iest tube #4? Explain in terms of LeChatelier's Principle the observed results from the addition of 0.1 M KSCN to test tube #4? .

Answer 1

only question 2 is answered as directed.

At the equilibrium the stock solution contains Fe^3 + (aq), SCN^- (aq) and [FeSCN]^2 + (aq). When NaoH is added to the solution then OH^- will react with Fe^3 + (aq) to produce a brown precipitate of Fe(OH)_3 Fe^3 + (aq) + 3 OH^- rightarrow Fe(OH)_3 down arrow The red colour of [Fe ScN]^2 + will get fainted as the previous equilibrium will shift in the backward direction as Fe^3 + ion is removed from the solution as Fe(OH)_3.