During this experiment you will conduct 5 trials of the reaction between KI and

Question

During this experiment you will conduct 5 trials of the reaction between KI and FeCls, using the volumes of liquids described in the table below. You will make each of these solutions as described in the subsequent steps. It is very important to make each solution right before running each trial in order to capture the reaction under the same time conditions. FeCls (mL) 20.0 20.0 10.0 15.0 10.0 Trial 20.0 10.0 20.0 10.0 15.0 HO (mL) 0.0 10.0 10.0 15.0 15.0 Conduct Trial 1 a. Measure 20.0 mL of FeCls solution into a 100 mL beaker. b. Measure 20.0 mL of kl solution into a second 100 mL beaker c. Add the 20.0 mL of FeCl3 solution to the beaker of KI solution. Swirl the beaker to mix. d. Rinse the cuvette twice with I-mL amounts of the reaction mixture, fill it 3/4 full, cap it and place it in the Spectrometer.

Explanation / Answer

1) safety precautions-FeCl3 is highly corrosive and acidic ,and skin and eye irritant-must be careful while handling it,.

a) molar concentration calculation

trial 1) molar concentration=(molarity*volume added =moles)/total volume

molarity =0.1 M (say ) not reported in the question

molar concentration of FeCl3==0.1 M *0.020 L/0.040L=0.05 M

Also molar concentration of KI==0.1 M *0.020 L/0.040L=0.05 M

2) a)part diagrams (image)

diagram is a plot between the molar concentration of limiting reagent (reactant present in relatively less molar concentration in all trials) and rate of product formationvs concentration of product.

As molar concentration increases ,product concentration also increases linearly

2)b) fastest rxn trial 1 with maximum molar concentrations of reactants that gives product at maximum rate.The reaction is pushed in forward direction.

slowest reaction is the one with most dilute reactants ,maximum H2O =trial 4 and 5

part 3)According to rate law,

rate=K=[A]^m [B]^n   where k=rate constant   A,B=reactants ,m=order with respect to A,n=order w.r.t B

here

a) overall order of rxn=m+n=1+1=2

b)m=order wrt A=1 ,n=order wrt B=1

c)rate=k [X][Y]=k3[Y]

k3=k[X]

[X]>>>[Y] so it is considered to be unchanged during the rxn=constant

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