Lab Lecture #3 Stoichiometry and the Chemical Equation I. Reaction of Hydrogen Peroxide and Bleach II. Reaction of Iron (II) with 1,10 Phananthroline Chemistry 142 A James B. Callis, Instructor Summer Quarter, 2004 What does this mean? __NaOCl(aq) + ___ H 2 O 2 (aq) ___ NaCl (aq) + ___O 2 (aq) + ___H 2 O(l) Find the reaction mole ratio Find coefficients on the reactant side Purpose: H 2 O 2 - NaOCl Stoichiometry. NaOCl 5.25% m/m NaOCl H 2 O 2 3.00 % m/m H 2 O 2. Method Given a fixed known mass (= known moles) of NaOCl we can find the moles of H 2 O 2 required to react completely with this known mass of NaOCl. Measure the volume of O 2 (g) generated at constant T and P. Find the lowest mass of H 2 O 2 that gives the limiting volume of O 2 (g) Spectrophotometric Titration of phen with iron(II) What is the correct formula? NN 3 Fe 2+ NN 2 Fe 2+ NN Fe 2+ Arrors indicate lone pair donation from the nitrogen to iron(II). These structures are not meant to display the 3-dimentional structure of these ions.