A stoppered vaccumm flask contains 7.5 mL of .906 M H2O2 and 10 mL H2O. The syri

ID: 498871 • Letter: A

Question

A stoppered vaccumm flask contains 7.5 mL of .906 M H2O2 and 10 mL H2O. The syringe holds 7.5 mL of 1.00 M KI.

a. What is the initial concentration of H2O2 in the reaction flask after all reactants are combined?

b. What is the initial concentration of KI in the reaction flask after all reactants are combined?

c. What is the final concentration of H2O2 in the reaction flask after the reaction is complete?

d. What is the final concentration of KI in the reaction flask after the reaction is complete?

e. What would be suitable quantities of .906 M H2O2, H2O, and 1.00 M KI to use in order determine the order of reaction in respect to [KI]?

a) total volume = 7.5 + 10 + 7.5 = 25mL in flask

Moles of H2O2 = Molarity X volume = 0.906 X 7.5 = 6.795 mmoles

so initial concentrtion of H2O2 = moles / Volume = 6.795 / 25 = 0.2718M

b) moles of KI = 1 X 7.5 = 7.5mmoles

concentration of KI = 7.5 /2 5= 0.3 M

c) one mole of H2O2 will react with two moles of KI

so moles of H2O2 left = 6.795- (7.5/2) = 3.045mmoles

concentration = 3.045/25 = 0.0122 M

d) there will be no left KI in the flask.

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