le chatelier principle lab 30 NAME QUESTIONS FOR LE CHATELIER\'S EXP. 1. a. Writ

Question

le chatelier principle lab

30 NAME QUESTIONS FOR LE CHATELIER'S EXP. 1. a. Write a balanced net ionic equation for the equilibrium reaction in Part A, formation of Fee (SCN b. For each of the changes in Part A, give the immediate effect of each perturbation on the value for Q (increase, decrease, or no change). Do the color changes you observed agree with the shift predicted by the change in Q? Explain your answers. i. additional iron is added ii, additional thiocyanate is added iii, additional water is added 31 2. a. Write a balanced net ionic equation for the equilibrium reaction in Part B, formation of Ni(NH

Explanation / Answer

Q1.

The net ionic equation should contain only Fe+3 and SCN- ions...w hich form Fe(SCN)+2

so

Fe3+(aq) + SCN-(aq) <--> Fe(SCN)2+(aq)

b)

Q --> product/reactant quotient

i --> addition of iron(III), Fe3+ should increase the reactants, therefore, the shift forwards toward the right, since it must counterbalance Fe(SCN)+2 (orange/red)

ii)

addition of thiocyanate, SCN- ion should increase the reactants, therefore, the shift forwards toward the right, since it must counterbalance Fe(SCN)+2 (orange/red)

iii)

additio of water increases volume, and decreases concentration

so

Q= [products]/[reactants]

so

Q = [Fe(SCN)+2] /([Fe+3][SCN-])

a decrease in concentrations affect Q in te reactant side, since there are two concentrations

so, this will favour:

Q increases

Q > K, then reactants will be formed in order to shift the equilibrium so Q = K

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