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The pH scale – practice for Years 8–9

Sample questions on The pH scale with the right answer and a worked solution, from easy to hard. In the Pickles Academy app a child gets new questions of the same kind every time, so they can't just learn the answers by heart.

Subject
Chemistry
Year
Years 8–9
Curriculum area
Compounds, acids and bases

Question types: Acidic, neutral or alkaline

Rule: The pH scale

pH 7 is neutral (pure water). Below 7 is acidic, above 7 alkaline; the scale runs from 0 to 14.

The further from 7, the stronger: pH 1 is more acidic than pH 5, pH 13 more alkaline than pH 9.

Example: Lemon juice is about pH 2 (acidic), soapy water about pH 10 (alkaline).

Watch out: A lower pH means more acidic, not weaker: pH 2 is more acidic than pH 4.

Sample questions

  1. Question 1 Easy

    Solutions A, B and C are marked on the pH scale. Decide whether each statement is true (YES) or not (NO).

    01234567891011121314ABCpH
    1. Solution A is acidic.
    2. Solution C is acidic.
    3. Solution A is more acidic than solution B.
    Show the solution
    Answer:
    1. Solution A is acidic. – no
    2. Solution C is acidic. – yes
    3. Solution A is more acidic than solution B. – yes

    How it works: A: pH 13, B: pH 14, C: pH 5. Below pH 7 is acidic, 7 is neutral, above 7 is alkaline. 1. NO 2. YES 3. YES

  2. Question 2 Normal

    Solutions A, B and C are marked on the pH scale. Decide whether each statement is true (YES) or not (NO).

    01234567891011121314ABCpH
    1. Solution A is alkaline.
    2. Solution B is neutral.
    3. Solution B is more acidic than solution C.
    4. Solution A is more alkaline than solution C.
    Show the solution
    Answer:
    1. Solution A is alkaline. – no
    2. Solution B is neutral. – no
    3. Solution B is more acidic than solution C. – no
    4. Solution A is more alkaline than solution C. – no

    How it works: A: pH 4, B: pH 12, C: pH 11. Below pH 7 is acidic, 7 is neutral, above 7 is alkaline. 1. NO 2. NO 3. NO 4. NO

  3. Question 3 Hard

    Solutions A, B and C are marked on the pH scale. Decide whether each statement is true (YES) or not (NO).

    01234567891011121314ABCpH
    1. Solution C is neutral.
    2. Solution B is more alkaline than solution A.
    3. Solution A is neutral.
    4. Solution A is more acidic than solution C.
    5. Solution B is acidic.
    Show the solution
    Answer:
    1. Solution C is neutral. – no
    2. Solution B is more alkaline than solution A. – no
    3. Solution A is neutral. – no
    4. Solution A is more acidic than solution C. – no
    5. Solution B is acidic. – no

    How it works: A: pH 14, B: pH 7, C: pH 5. Below pH 7 is acidic, 7 is neutral, above 7 is alkaline. 1. NO 2. NO 3. NO 4. NO 5. NO

Related topics

All Chemistry topics

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