Chem 142 Lab 2

Stoichiometry I

Lab 3 setupThe objective of this experiment is to determine the molar ratio, or stoichiometry, between the reactants of a chemical reaction. By holding the number of moles of reactant A constant and varying the moles of reactant B, you will determine the number of moles of B required to react completely with the amount of A present so that neither reagent is limiting or in excess.

 

In Part I of this lab, you will look at the reaction between hydrogen peroxide (H2O2) and bleach (NaOCl). When these two chemicals are mixed, oxygen gas (O2) is produced and the volume of gas produced is measured as a function of the amount of hydrogen peroxide added to a fixed amount of bleach.

 

? H2O2(aq) + ? NaOCl (aq) —› O2(g) + other products

 

In Part II of this lab, you will work with a reaction that produces a colored species. You will add an iron (Fe2+) solution to 1,10-phenanthroline and measure the intensity of the colored product as a function of the amount of Fe2+ added to a fixed amount of 1,10-phenanthroline solution.

 

Fe2+ (aq) + n (1,10-phenanthroline) (aq) —› Fe(1,10-phenanthroline)n (aq)

 

  • Prelab
    • Intro (pdf 255 KB, rev 12/22/11)
    • Required Prelab Assignment in Canvas (due Tuesday 7/16 at 12:30 pm)
    • Review Materials & Procedure
    • Review Demonstration

 

 

 

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