Question

Determination of dissolved oxygen (do) in the water sample

Answer 1

Explanation:

The Winkler Method uses titration to determine dissolved oxygen in the water sample.

A sample bottle is filled completely with water. The point of color change is called the "endpoint," which coincides with the dissolved oxygen concentration in the sample.

Answer 2

Explanation:

The Winkler Method uses titration to determine dissolved oxygen in the water sample. A sample bottle is filled completely with water (no air is left to skew the results). The point of color change is called the "endpoint," which coincides with the dissolved oxygen concentration in the sample.