Explore BrainMass

Explore BrainMass

    KMNO4 and H2O2 Lab

    Not what you're looking for? Search our solutions OR ask your own Custom question.

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    Chemistry Lab
    1. Take a burette from the glassware shelf and place it on the workbench.
    2. Fill the burette with 50mL of 0.2M potassium permanganate solution. Record concentration.
    3. Take flask and add 10mL of New hydrogen peroxide (New H2O2).
    4. Add 2mL of 6M sulfuric acid to flask.
    5. Titrate the hydrogen peroxide with the KMnO4 solution to the purple endpoint of excess MnO4- ion. First do rough titration by adding KMnO4 2mL at a time in order to quickly find range in which endpoint is reached. Do fine titration two times in order to obtain exact results.
    6. Repeat the procedures with the bottle of old hydrogen peroxide (old H2O2).

    Molarity of KMnO4: 0.2M
    Volume of H2O2: 10mL

    Titration of KMnO4 and New H2O2
    Trial 1(rough) Trial 2(fine) Trial 3(fine)
    Initial Volume: 50mL 50mL 50mL
    Final Volume: 30mL 31.90mL 31.95mL

    Titration of KMnO4 and Old H2O2
    Trial 1(rough) Trial 2(fine) Trial 3(fine)
    Initial Volume: 50mL 50mL 50mL
    Final Volume: 36mL 37.30mL 37.35mL

    Calculations/Interpretations-Show all math performed, formulas, label. Use proper significant figures.
    Trial2 Trial 3
    Volume of KMnO4 (new H2O2): 50mL-31.90mL=18.1mL 50mL-31.95mL= 18.05mL
    Average: (18.1mL +18.05mL)/2 = 18.075mL

    Trial 2 Trial 3
    Volume of KMnO4 (old H2O2): 50mL-37.30mL= 12.7mL 50mL- 37.35mL= 12.65mL
    Average: (12.7mL+12.65mL)/2 = 12.675mL

    1. Moles of KMnO4 (new H2O2):
    2. Moles KMnO4 (old H2O2):

    Balanced Equation:
    2KMnO4 + 5H2O2 + 3H2SO4 => K2SO4 + 2MnSO4 + 8H2O + 5O2

    Using the average values from trials 2 and 3 and the balanced equation, calculate the following:

    3. Moles H2O2 (new):
    4. Moles H2O2 (old):

    5. Molarity H2O2 (new):
    6. Molarity H2O2 (old):

    © BrainMass Inc. brainmass.com March 4, 2021, 10:05 pm ad1c9bdddf


    Solution Summary

    This solution explains how to solve a lab dealing with potassium permanganate and hydrogen peroxide.