The pH scale and pH calculations

Answer Key - Grade 10 Science Worksheet - Building Confidence

Circle the best answer, or write your answer on the line.

1. 1.

   A vinegar-like solution has [H⁺] = 0.001 M. Using pH = −log[H⁺], what is its pH, Ari?

   3
2. 2.

   A rain-like solution has [H⁺] = 0.00001 M. Using pH = −log[H⁺], what is its pH, Bo?

   5
3. 3.

   A lemon-like solution has [H⁺] = 0.01 M. Using pH = −log[H⁺], what is its pH, Esme?

   2
5. 4.

   Using the strip, which liquid is the most acidic, Jun?

   • Lemon juice
   • Pure water
   • Vinegar
6. 5.

   Using the strip, is milk of magnesia acidic or basic, Kira?

   Use the picture in question 4.

   • Neutral: it is a medicine
   • Acidic: its pH is above 7
   • Basic: its pH is above 7
7. 6.

   Using the strip, how does [H⁺] change from pH 2 to pH 3, Luz?

   Use the picture in question 4.

   • It rises ten times
   • It falls to a tenth
   • It falls by 1 mol/L
8. 7.

   How many times more H⁺ does a pH 3 solution have than a pH 5 solution, Noah?

   • 100 times
   • 200 times
   • 2 times
9. 8.

   Which pH has ten times more H⁺ than pH 6, Pia?

   • pH 7
   • pH 5
   • pH 0.6
10. 9.

    At 25 °C, what pH is neutral, Ren?

    • 14
    • 7
    • 0
11. 10.

    A solution has pH 9 at 25 °C. Is it acidic, neutral or basic, Tala?

    • Neutral
    • Basic
    • Acidic