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Homework Help: Electrochemistry Lab Part C

  1. Feb 8, 2010 #1
    1. The problem statement, all variables and given/known data
    I am required to determine an average molarity for sodium hypochlorite solution, the experiment involved titrating 10 mL of 1:10 diluted bleach (sodium hypochlorite) with sodium thiosulfate, the volumes of titrant used to reach endpoint are, 17.95 mL, 18.31 mL and 18.21 mL, respectively. The molarity of sodium thiosulfate was determined to be 0.072 M in the previous section.

    2. Relevant equations
    the reaction equation is:
    2 Na2S2O3(aq) + NaClO(aq) + H2O(aq) → Na2S4O6(aq) + NaCl(aq) + 2 NaOH(aq)

    net ionic equation:
    2 S2O32-(aq) + ClO-(aq) + H2O (l) → S4O62-(aq) + Cl-(aq) + 2 OH-(aq)

    3. The attempt at a solution
    I am unsure how to use this information to find 3 values for the molarity of sodium hypochlorite,
  2. jcsd
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