Concept:The pH scale measures how acidic or basic a solution is. A pH below 7 indicates a higher concentration of hydrogen ions (H⁺), meaning the solution is acidic.
Explanation:The pH scale ranges from 0 to 14.
pH = 7 is neutral (equal H⁺ and OH⁻).
pH less than 7 is acidic.
pH greater than 7 is basic (alkaline).
Acidic solutions have more H⁺ ions and can donate protons. Examples include lemon juice, vinegar, and hydrochloric acid.
Strong acids have very low pH (0–3), while weak acids are closer to 7.
The term "hypotonic" relates to solute concentration across a membrane, not pH.
Thus, a solution with pH < 7 is acidic.
Answer:C. Acidic solution