Calculate the amount of dissolved oxygen

Question

In the year 2025, NASA was able to find another planet (XXV) which may be able to sustain life. In order to determine if the planet’s water can sustain an earth organism’s life, Winkler method was employed to determine dissolved oxygen content. A water sample from planet XXV was obtained and then treated with the usual reagents for Winkler titration. A 50.0 mL aliquot of this sample was titrated with the 0.010196M Na2S2O3 standard solution. It required 4.16 mL of the titrant to reach the starch endpoint.

A. Calculate the amount of dissolved oxygen in the sample in terms of ppm O2. (FW O2 = 32.00)

Answer 1

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