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The amount of oxygen dissolved in a water sample at 25 deg C can be determined by titration. The first step is to add solution of MnSO4 and NaOH to the water to convert the dissolved oxygen to MnO2. A solution of H2SO4 and KI is then added to convert the MnO2 to Mn+2, and the iodide ion is converted to I2. The I2 is then titrated with standardized Na2S2O3. a. Balance the equation for the reaction of Mn+2 with O2 in basic solution. b. Balance the equation for the reaction of MnO2 with I- . c. Balance the equation for the reaction of S2O3 -2 with I2. d. Calculate the amount of O2 in 25.0 mL of water if the titration requires 2.45 mL of 0.0112M Na2S2O3 solution.
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