Question

how do acids and bases affect the quality of freshwater sources?
○ acids and bases raise the ph of freshwater.
○ acids and bases lower the ph of freshwater.
○ acids lower the ph of freshwater and bases raise the ph of freshwater.
○ acids raise the ph of freshwater and bases lower the ph of freshwater.

Explanation:

Acids release hydrogen ions ($H^+$) in water, which decreases pH (values <7). Bases release hydroxide ions ($OH^-$) or accept $H^+$, which increases pH (values >7). This directly alters freshwater chemistry and quality.

Answer:

Acids lower the pH of freshwater and bases raise the pH of freshwater.