Show work please PART I: Concentration Dependence 1. Calculate the molarity of e

Question

Show work please PART I: Concentration Dependence 1. Calculate the molarity of each reactant (1-.BO,-.H) for all five contained in TABLE 14-1. Summarize your answers in the table below. trials based on the information 2. Use the time specified for trials 1 through 4 to calculate reaction rats onstant. Summarize reaction rates for each trial, the reaction order for each reactant, a rate constant for each trial, and the average rate your answers on the following page. Calculate the theoretical rate expected for trial 5 based on the INSTANTANEOUS LAW you determined in question 2. Calculate the observed rate of trial 5 based on the time specified for trial 5. 3. 4. What is the RELATIVE ERROR for trial 5? (Relative error is defined in the Mass- Volame Exercise, experiment orfe in this book.) READ THE EXPERIMENTAL DISCUSSION FIRST! Complete the data tables below using the correct significant digits. these to ensure that you A few calculation results are shown for you. You may wish to verify one or more of are using the correct method of calculation ART I: Concentration Dependence Concentration of Reactants Time Rate Trial I-l BrO,1 (H'1 0.020 119 8.4 x 1070.0020 0.0080 0.0200 26106, x10 0.04, 0.016 0.020 59 16.9 x 10-7 29 162 0.0020 4 THE TEMPERATURE OF TRIAL ONE WAS 21.0°C (See the next page.)

Explanation / Answer

6I-(aq) + BrO3-(aq) + 6H+ -> 3I2(aq) + Br-(aq) + 3 H2O

The rate law, rate = k *[I-]^x*[BrO3-]^y*[H+]^z

rate = -?[I-] / 6?t = -?[BrO3-] / ?t = -?[H+] / 6?t

= ?[I2] / 3?t = ?[Br-] / ?t = ?[H2O] / 3?t

To calculate volume of 1 drop of solution

volume of one drop =( mass 1 drop/1.00[g/mL])*(1 L/1000 mL)=.......... L

average mass of 1 drop of water = 0.408g

volume of one drop =( mass 1 drop/1.00[g/mL])*(1 L/1000 mL)=.......... L

=(0.0408g)/100 [g/mL])*(1 L/1000 mL)=4.08*10^-5

= 4.08 * 10^-5

To calculate the rate

Moles of S2O3 = Molarity of S2O3 * Volume of 1 drop

Moles of BrO3 reacted = Moles of S2O3 2- * Mole ratio

Change in BrO3 concentration = Moles of BrO3 reacted/ Volume of 12 drops

Rate = Change in BrO3 concentration/Average tim

To calculate initial concentration

The reactants: I- (KI), BrO3-(KBrO3), and H+(HCl)

Sample with BrO3:

Moles of BrO3 = initial volume * initial molarity

Initial concentration= moles BrO3/volume of 12 drops

To calculate order of each reactant

Rate = k ([ I-]^x)([ BrO3-]^y)([H+ ]^z)

Sample for comparing experiment 1 and 2:

exp 1: Rate1..... = k ([ ]^x)([ ]^y)([ ]^z)

exp 2: Rate2..... = k ([ ]^x)([ ]^y)([ ]^z)

Rate1/Rate 2=([ ]^x)/([ ]^x)

To find rate constant

Rate=k[I-][BrO3-][H+]^2

k=(Rate)/([I-][BrO3-][H+]^2)

k=(M/s)/(M^4)=M^-3*s^-1

For [I-],

Trial [I-]

1 0.002

2 0.004

3 0.002

4 0.002

5 0.0016

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