To Determine the Dissolved Oxygen Content in Water

Question 1

How do you carry out this titration?

Answer 1

Wet bottle to stop bubbles of air sticking to the sides.
Fill and stopper under water- to ensure no bubbles.
Add conc. MnSO4 and alkaline KI (KI + KOH) using a dropper under water to prevent reaction with O2 in air or introduction of air.