Question

Procedures Place two 150 mL Erlenmeyer flasks from the Containers shelf on the workbench. Double-click on the flasks to label one flask “A” and the other “B”. Obtain a 10 mL graduated cylinder and a 50 mL graduated cylinder from the Containers shelf. Place two constant temperature baths from the Instruments shelf onto the workbench.   Set the temperature on each bath to 21.5 °C. The contents of each flask will vary with each trial as indicated in the table below. Flask contents Flask A Flask B Trial Volume of 0.2 M Potassium Iodide (mL) Volume of 0.2 M Potassium Nitrate (mL) Volume of 0.2% starch (mL) Volume of 0.2 M Ammonium Persulfate (mL) Volume of 0.2 M Ammonium Sulfate (mL) Volume of 0.01 M Sodium Thiosulfate (mL) Trial 1 25 0 5 25 0 10 Trial 2 25 0 5 12.5 12.5 10 Trial 3 25 0 5 6.25 18.75 10 Trial 4 12.5 12.5 5 25 0 10 Trial 5 6.25 18.75 5 25 0 10 5. For trial 1, measure the indicated volume of each reagent from the Materials shelf using the appropriate graduated cylinder, then add to the flask. 6. Record the color of the initial solutions. 7. Move each flask into a water bath. 8. Pour the contents of flask B into flask A. Immediately note the time, including seconds, from the laboratory clock or other timing device. 9. Note the time elapsed when the color changes from clear to black. Record the time. 10. Discard all materials in the waste, then place the containers in the sink. 11. Repeat steps 1 – 10 for trials 2 – 5. 12. Clear the bench of all materials, containers, and instruments, then return to your course page to complete any assignments for this lab.

Trial 1 FA no color initial

FB no color initial

using time: 34s

Trial 2 FA no color initial

FB no color initial

using time: 67s

Trial 3 FA no color initial

FB no color initial

using time: 124s

Trial 4 FA no color initial

FB no color initial

using time: 66s

Trial 5 FA no color initial

FB no color initial

using time: 124s

What was the concentration of peroxodisulfate in Trial 1?

Select one:

a. 0.0769 M

b. 0.0879 M

c. 0.0669 M

d. 0.0569 M

What was the concentration of peroxodisulfate in Trial 2?

Select one:

a. 0.0302 M

b. 0.0418 M

c. 0.0385 M

d. 0.0488 M

What was the concentration of peroxodisulfate in Trial 3?

Select one:

a. 0.0075 M

b. 0.0132 M

c. 0.0212 M

d. 0.0192 M

What was the concentration of iodide in Trial 1?

Select one:

a. 0.0769 M

b. 0.0659 M

c. 0.0571 M

d. 0.0869 M

What was the concentration of iodide in Trial 4?

Select one:

a. 0.0411 M

b. 0.0385 M

c. 0.0305 M

d. 0.0460 M

What was the concentration of iodide in Trial 5?

Select one:

a. 0.0202 M

b. 0.0128 M

c. 0.0192 M

d. 0.0282 M

And plz show the procedure of how to do it. Thank you so much

Answer 1