In body of fresh water, a dissolved oxygen concentration of 0.225 mM or higher is usually needed to maintain a healthy aquatic ecosystem. For a lake to maintain this concentration, what is the maximum water temperature?

35 Confirmation: 35 is right.

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35 C

26 C

To determine the maximum water temperature for a lake to maintain a dissolved oxygen concentration of 0.225 mM or higher, we need to consider the relationship between water temperature and dissolved oxygen levels.

The solubility of oxygen in water decreases as temperature increases. This means that warmer water can hold less dissolved oxygen compared to colder water. Therefore, to maintain a higher dissolved oxygen concentration, the water temperature needs to be lower.

To find the maximum water temperature, we can refer to a dissolved oxygen solubility chart or table. These charts show the maximum dissolved oxygen concentrations at various temperatures. By examining the chart, you can identify the highest temperature that corresponds to a dissolved oxygen concentration of 0.225 mM or higher.

Here's an example of a table showing the relationship between dissolved oxygen and temperature:

Temperature (°C) Dissolved Oxygen (mM)
--------------------------------------------
0 14.6
5 11.1
10 9.0
15 7.7
20 6.7
25 5.9
30 5.2
35 4.6
40 4.1

From the table, you can see that the maximum dissolved oxygen concentration of 0.225 mM or higher falls within the temperature range of 0°C to 5°C. Therefore, the maximum water temperature for the lake to maintain this concentration is 5°C.