Grade 10 · Science · Chemistry

10th grade The pH scale and pH calculations worksheet

6 printable versionsBuilding Confidence10 questions · answer keyFree · no account

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The pH scale and pH calculations

Grade 10 Science Worksheet - Building Confidence

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

A vinegar-like solution has [H⁺] = 0.001 M. Using pH = −log[H⁺], what is its pH, Ari?
A rain-like solution has [H⁺] = 0.00001 M. Using pH = −log[H⁺], what is its pH, Bo?
A lemon-like solution has [H⁺] = 0.01 M. Using pH = −log[H⁺], what is its pH, Esme?
4.
Using the strip, which liquid is the most acidic, Jun?
- Vinegar
- Pure water
- Lemon juice
5.
Using the strip, is milk of magnesia acidic or basic, Kira?
Use the picture in question 4.
- Acidic: its pH is above 7
- Basic: its pH is above 7
- Neutral: it is a medicine
6.
How many times more H⁺ does a pH 3 solution have than a pH 5 solution, Noah?
- 2 times
- 200 times
- 100 times
7.
Which pH has ten times more H⁺ than pH 6, Pia?
- pH 5
- pH 0.6
- pH 7
8.
At 25 °C, what pH is neutral, Ren?
- 14
- 7
- 0
9.
A solution has pH 9 at 25 °C. Is it acidic, neutral or basic, Tala?
- Neutral
- Basic
- Acidic
10.
Which has more OH⁻ than H⁺, Zee?
- A solution at pH 11
- A solution at pH 3
- Pure water at 25 °C

The pH scale and pH calculations. Every version has 10 questions, and the answer key prints on the second page.

I can find pH from [H⁺] with pH = −log[H⁺], starting with exact powers of ten.
I can say that each pH step is ten times the H⁺, and that at 25 °C 7 is neutral and pH + pOH = 14.
I can go from [OH⁻] to pOH to pH, and from pH back to [H⁺].
I can place household liquids on the strip and compare them.

Standard: none (TX, FL)

pH: −log[H⁺]; lower means more acidic

pOH: −log[OH⁻]

neutral: Equal H⁺ and OH⁻; pH 7 at 25 °C

Kw: [H⁺] × [OH⁻] = 1.0 × 10⁻¹⁴ at 25 °C

logarithm: The power of ten a number equals

Your child dropped the minus sign in pH = −log[H⁺]. The log of a small number is negative, so the minus makes pH positive.

Your child gave the pOH. From [OH⁻] you get pOH first; then pH = 14 − pOH at 25 °C.

Your child counted decimal places and rounded up. pH is −log[H⁺], which lands between whole numbers here.

What is the most common mistake with the ph scale and ph calculations?

Your child dropped the minus sign in pH = −log[H⁺]. The log of a small number is negative, so the minus makes pH positive.

Are these 10th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

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