Student runs a chemical kinetics experiment following the method of initial rates. 1) The data in the table below were obtained for the reaction: 2 ClO2 (aq) + 2 OH- (aq) → ClO3-(aq) + ClO2-(aq) + H2O (1) [ClO2](M) [OH-1](M) Initial Rate (M/s) Experiment 1: 0.060 0.030 0.0248 Experiment 2: 0.020 0.030 0.00276 Experiment 3: 0.020 0.090 0.00828 a) Using the method of initial rates what is the order of the reaction with respect to ClO2? b) Using the method of initial rates what is the order of the reaction with respect to OH-? c) Calculate k using experiment 1.
CHEM 1B
1.
Student runs a chemical kinetics experiment following the method of initial rates. 1) The data in the table below were obtained for the reaction:
2 ClO2 (aq) + 2 OH- (aq) → ClO3-(aq) + ClO2-(aq) + H2O (1)
[ClO2](M) [OH-1](M) Initial Rate (M/s)
Experiment 1: 0.060 0.030 0.0248
Experiment 2: 0.020 0.030 0.00276
Experiment 3: 0.020 0.090 0.00828
a) Using the method of initial rates what is the order of the reaction with respect to ClO2?
b) Using the method of initial rates what is the order of the reaction with respect to OH-?
c) Calculate k using experiment 1.
2.
Using the concentrations found in the experiment for the iron cation and thiocyanate anion determine the Kc for iron (III) thiocyanate using 1.71mL of iron cation solution and 4.00 mL of thiocyanate anion solution. The absorbance for this mixture at 460 nm is 0.339. Show your calculations.
3. Molar Volume of a Gas Experiment
a) You collected 44.1 mL of hydrogen gas in a eudiometer following the procedure outlined in this experiment. You used 0.0462 grams of magnesium. The collected gas had a temperature of 22.0 °C and a pressure of 753 torr. 22.0 mm of waterremained in the Eudiometer (height of the water column). Based on this data determine the molar volume of a gas at STP.The vapor pressure of water at 22.0° C is 19.83 torr.
b) Calculate the percent error of the molar volume based on the known value and the experimental value from part a.
4. Beer’s Law
a) What is lmax and why is it needed? Explain in 2-3 sentences.
b) How is Beer's Law used to determine the Kc value in the equilibrium experiment of iron (III) cation with thiocyanate anion? Explain in 2-3 SENTENCES. No equations should be used here!
5. Acid/Base Dissociation Constants
You are given a 0.25 M solution of an unknown weak base. You do a 1/10th dilution of this solution and find that the diluted solution has a pH= 11.2.
a) Write out an equation that illustrates the reaction of the base with water.
b) Determine the Kb and the Ka for this weak base.
 [OH-] (M) (M/s)
Initial Rate
1
0,060
0.030
0.0248
2
0.020
0,030
0,00276
3
0.020
0.090
0.00828
a) Using the method of initial rates what is the order of the reaction with respect to ClO,? (5 points)
b) Using the method of initial rates what is the order of the reaction with respect to OH? (5 points)
c) Calculate k using experiment 1. (5 points)
2. Chemical Equilibrium Experiment
Using the concentrations found in the experiment for the iron cation and thiocyanate anion determine the Kc for iron (III)
thiocyanate using 1.71mL of iron cation solution and 4.00 mL of thiocyanate anion solution. The absorbance for this mixture
at 460 nm is 0.339. Show your calculations. (15 points)
3. Molar Volume of a Gas Experiment
a) You collected 44.1 mL of hydrogen gas in a eudiometer following the procedure outlined in this experiment. You used
0.0462 grams of magnesium. The collected gas had a temperature of 22.0 °C and a pressure of 753 torr. 22.0 mm of water
remained in the Eudiometer (height of the water column). Based on this data determine the molar volume of a gas at STP.
The vapor pressure of water at 22.0° C is 19.83 torr. (15 points):
b) Calculate the percent error of the molar volume based on the known value and the experimental value from part a). (5
points)
4. Beer's Law
a) What is Amax and why is it needed? Explain in 2-3 sentences. (5 points)
b) How is Beer's Law used to determine the Kc value in the equilibrium experiment of iron (III) cation with thiocyanate
anion? Explain in 2-3 SENTENCES. No equations should be used here!(10 points)
5. Acid/Base Dissociation Constants
You are given a 0.25 M solution of an unknown weak base. You do a 1/10th dilution of this solution and find that the diluted solution
has a pH= 11.2.
a) Write out an equation that illustrates the reaction of the base with water. (5 points)
b) Determine the Kb and the Ka for this weak base. (10 points)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd57af4f0-c9cd-4376-813d-79fb08902566%2F28cdfcc8-b7b2-469d-9025-43b07678c9b6%2Fhfnb8rp_processed.png&w=3840&q=75)
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