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(a) A standard iodine solution was standardized against a 0.4123 g primary standard As4O6 by dissolving...

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Chemistry

(a) A standard iodine solution was standardized against a 0.4123g primary standard As4O6 by dissolving the As4O6 in a small amountof NaOH solution, adjusting the pH to 8, and titrating, requiring40.28 mL iodine solution. What is the concentration of the iodinesolution?

As4O6 (s) + 6H2O -> 4H3AsO3

H3AsO3 +I3^- + H2O -> H3AsO4 + 3I^- + 2H^+

(b) The purity of a hydrazine (N2H4) sample is determined bytitration with triiodide. A sample of the oily liquid weighting1.4286 g is dissolved in water and diluted to 1 L in a volumetricflask. A 50.00 mL aliquot is taken with a pipette and titrated withthe standard iodube solution in (a), requiring 42.41 mL. What isthe percent purity by weight of the hydrazine?

N2H4 + 2I3^- -> N2 + 6I^- +4H^+

Answer & Explanation Solved by verified expert
4.2 Ratings (474 Votes)
Number of moles of As4O6 Mass Molecular mass 04123 g 39568 g mol1 0001042 moles As4O6s 6 H2O 4 H3AsO3 4 H3AsO3 4 I3 4 H2O 4 H3AsO4 12 I 8 H According to stoichiometry of reaction 1 mol As4O6 reacts with 4 moles I3 moles I So    See Answer
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