Why would fish not live long in water which has been boiled and then cooled?

Question

fish need oxygen in order to live. they contain this oxygen from water filtered through their gills. using what you have learned about solubility, why would fish not live long in water which has been boiled and then cooled?

Answer 1

Boiling deoxygenates water. So even if it's cooled, it's not good for the fish.

Answer 2

Because gases are less soluble in water at high temperatures, most of the dissolved oxygen escapes the water when boiled. Cooling the water will not recover enough oxygen quickly so do not put the fish yet.

Answer 3

Gases are less soluble in hot liquids than in cold liquids. As you heat the water, the oxygen dissolved in the water (take note: not the oxygen in the molecule H2O!) is released into the atmosphere. Even as you cool the water, the oxygen is not replaced (you will have to provide aquatic plants or man-made oxygenators to replace the oxygen).