Calculation

Question 1

Calculating moles of KIO3

Answer 1

• Identify the number of C6H8O6 moles consumed for 1 mole of KIO3
• use the molar mass of C6H8O6 to find the amount of moles in 10 mg
• find how many moles of KIO3 are required to react with the calculated moles of C6H8O6 in 10 mg

Question 2

Calculate the concentration of a standard KIO3 solution

Answer 2

• Use the number of moles of KIO3 divided by the liters given

Question 3

Calculate mass of KIO3 required

Answer 3

• find the moles from multiplying the molarity multiplied by the volume
• find the number of grams by multiplying the moles by the molar mass

Question 4

Partition coefficient of caffeine

Answer 4

the ratio of relative solubilities in the two solvents
ex: 18.2g/100mL / 2.18g/100mL = 8.35

Question 5

Equation for extraction of caffeine

Answer 5

8.35 = x/mL DCM / mg-x/mL water, repeat this however times they instruct you

Question 6

How do you find the initial concentration of dye/bleach in solution

Answer 6

Times the molarity by the initial volume divided by the final volume

Question 7

What is the reaction order with respect to dye

Answer 7

1st order

Question 8

How do you get k’

Answer 8

from the slope of the kinetic trace

Question 9

Molar concentration of the unknown sample

Answer 9

Times the beers law slope by the total concentration (100%/M). Then divide absorbance by the value you found above.

Question 10

How do you find the instantaneous rate

Answer 10

Find the concentration by dividing the absorbance by the molar concentration (slope times 100%/concentration dye). Then times that by k’.