Question

The order of solubility of oxygen in water is

• A. Hot water > cold water
• B. Cold water > hot water
• C. Soluble equally in both
• D. Cannot be predicted

Answer 1

The correct option is B Cold water > hot water

As we already discussed in previous question, as the temperature increases solubility of a gas decreases because dissolution is exothermic and according to Le chatelier principle we have to decrease the temperature to make the dissolution to move forward. So amount of oxygen dissolved in hot water is less than in cold water.
Now can you tell the reason why fish die in aquarium on a hot summer day.
Answer is … fish die in aquarium on hot summer day as there is less amount of oxygen in water because the solubility of oxygen is very less.