The dissolved oxygen in a water sample is estimated by modified Winkler method. A 200 ml volume of dissolved-oxygen-fixed solution is titrated with
A. Sodium thiosulfate reagent using soluble starch as an indicator
B. Sodium thiosulfate reagent using ferrion as an indicator
C. Ferrous ammonium sulfate reagent using soluble starch as an indicator
D. Ferrous ammonium sulfate reagent using ferrion as an indicator
Answer:A
The dissolved oxygen in a water sample is estimated by modified Winkler method. A 200 ml volume of dissolved-oxygen-fixed solution is titrated with
A. Sodium thiosulfate reagent using soluble starch as an indicator B. Sodium thiosulfate reagent using ferrion as an indicator C. Ferrous ammonium sulfate reagent using soluble starch as an indicator D. Ferrous ammonium sulfate reagent using ferrion as an indicator