Most aquatic organisms can survive only within a specific ph range. an increase in the number of hydrogen ions (h+) in a lake with many aquatic organisms would cause
a.
the acidity of the lake to decrease.
b.
no change in the ph of the lake.
c.
the water in the lake to evaporate.
d.
the acidity of the lake to increase.

Option D, the acidity of the lake to increase.

Explanation:

The increase of hydrogen ion in lake water increases the acidity of the lake. The acidity of lake is associated with pH of the water which depends on the hydrogen ions concentration as established by the equation given below –  

pH

The hydrogen ion concentration is directly proportional to the acidity of the lake water. Thus, higher the H+ ion concentration, the higher will be  the acidity of water.