Answer to Question #138939 in General Chemistry for Flicker Loser

Question

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.

Answer 1

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