A solution with pH 1 is considered what type of acid strength?

• A. Weak acid
• B. Moderate acid
• C. Strong acid
• D. Neutral

Answer: (C)

pH shows how acidic a solution is, with lower numbers meaning more hydrogen ions. A pH of 1 means a very high concentration of H+ ions—0.1 moles per liter. When an acid is strong, it dissociates completely in water to release all its hydrogen ions, so solutions can reach such low pH values easily. That’s why a solution with pH 1 is categorized as a strong acid.

If it were neutral, the pH would be around 7, and if the acid were weak, it would not release as many H+ at the same concentration, giving a higher pH. The term “moderate” isn’t used to describe acid strength in this context, because pH 1 clearly indicates a very strong acidity.