Lab Lecture

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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
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Purpose H2O2 - NaOCl Stoichiometry.
What does this mean? __NaOCl(aq) ___ H2O2
(aq) ?___ NaCl (aq) ___O2(aq)
___H2O(l) Find the reaction mole ratio Find
coefficients on the reactant side
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NaOCl ? 5.25 m/m NaOCl H2O2 ? 3.00 m/m H2O2.
Method

• Given a fixed known mass ( known moles) of NaOCl
  ? we
• can find the moles of H2O2 required to react
  completely with this
• known mass of NaOCl .
•  
• Measure the volume of O2(g) generated at
  constant T
• and P.
• Find the lowest mass of H2O2 that gives the
  limiting
• volume of O2(g)

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Spectrophotometric Titration of phen with iron(II)
What is the correct formula?
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.
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