Chem 30 LAB 13.4 Analyzing a Hydrogen Peroxide Solution

Chem 30 LAB 13.4
Analyzing a Hydrogen Peroxide Solution
pg 599, 603

Problem
What is the percent concentration of hydrogen peroxide in a
consumer product?

Prediction
In drugstores, hydrogen peroxide is usually sold as a 3% solution. Hairdressers use a 6%
solution. Based on this knowledge, The percent concentration of hydrogen peroxide in a
consumer product should be no less than 3% and no more that 6%

Design
Manipulated : volume of KMnO₄
Responding : color change
Controlled : volume of iron solution, volume of H₂O₂ solution flasks, beakers

Pre-Lab Calculation

FeSO₄ ・(NH₄)₂SO₄・6H₂O(s)
C=0.0500mol/L
V= 100.0mL
n=(0.0500mol/L)(100.0mL)
n=5.00mmol
m=(5.00mmol)(392.15b/mol)
m=1.96g

Required mass of FeSO₄ ・(NH₄)₂SO₄・6H₂O(s) to make 100.0ml of a 0.0500mol/L solution

Materials
See Nelson text pg 603
↳Ring stand and burette with burette clamp
↳Erlenmeyer flask
↳Pipette

Procedure
See Nelson text pg 603
↳note KMnO₄ in burette stand may have to be refilled more than once




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