Acid–alkali indicators
3 marks · NormalA solution has a pH of 2.5. State whether this solution is strongly acidic, weakly acidic, neutral, weakly alkaline, or strongly alkaline. Explain your answer using the pH range classifications.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
strongly acidic
Common mistakes: Incorrectly labelling 2.5 as weakly acidic
Show mark scheme and worked solution
Marking points
M1 · 1 mark · Identifies the solution as strongly acidic.
M2 · 1 mark · States the pH range for strongly acidic solutions (0–3).
M3 · 1 mark · Compares 2.5 to the strongly acidic range.
Worked solution
The solution has pH 2.5. The range for strongly acidic solutions is 0–3. Since 2.5 falls within this range, it is classified as strongly acidic.