pH and hydrogen ion concentration
12th grade (Year 13 in England) · 16 questions · Common Core: NGSS.HS-PS1-6 · England: GCSE Chemistry: Chemical changes (strong and weak acids, Higher)
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Question 1
Solution X has pH 2 and solution Y has pH 4. How many times greater is the hydrogen ion concentration in X than in Y?
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Question 2
A strong acid solution has a hydrogen ion concentration of 0.1 mol/dm³. What is its pH? (pH = −log₁₀[H⁺])
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Question 3
Which statement about "concentrated" and "strong" is correct?
- A. A weak acid can be concentrated, and a strong acid can be dilute
- B. Weak acids are always dilute
- C. They mean the same
- D. Strong acids are always concentrated
Question 4
Solution X has pH 2 and solution Y has pH 5. How many times greater is the hydrogen ion concentration in X than in Y?
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Question 5
A strong acid solution has a hydrogen ion concentration of 1 × 10⁻⁶ mol/dm³. What is its pH? (pH = −log₁₀[H⁺])
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Question 6
Ocean water's pH has fallen from about 8.2 to about 8.1 since the 1800s. Roughly how has the H⁺ concentration changed?
- A. it has increased by about 25–30 %
- B. it has not changed
- C. it has fallen by half
- D. it has increased 10 times
Question 7
Solution X has pH 4 and solution Y has pH 5. How many times greater is the hydrogen ion concentration in X than in Y?
Answer
Question 8
A strong acid solution has a hydrogen ion concentration of 1 × 10⁻⁵ mol/dm³. What is its pH? (pH = −log₁₀[H⁺])
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Question 9
Which statement about "concentrated" and "strong" is correct?
- A. Weak acids are always dilute
- B. They mean the same
- C. A weak acid can be concentrated, and a strong acid can be dilute
- D. Strong acids are always concentrated
Question 10
Solution X has pH 1 and solution Y has pH 4. How many times greater is the hydrogen ion concentration in X than in Y?
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Question 11
A strong acid solution has a hydrogen ion concentration of 1 × 10⁻² mol/dm³. What is its pH? (pH = −log₁₀[H⁺])
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Question 12
A strong acid is diluted so its H⁺ concentration becomes 10 times smaller. What happens to its pH?
- A. it rises by 1
- B. it rises by 10
- C. it does not change
- D. it falls by 1
Question 13
Solution X has pH 5 and solution Y has pH 8. How many times greater is the hydrogen ion concentration in X than in Y?
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Question 14
A strong acid solution has a hydrogen ion concentration of 1 × 10⁻² mol/dm³. What is its pH? (pH = −log₁₀[H⁺])
Answer
Question 15
Which statement about "concentrated" and "strong" is correct?
- A. They mean the same
- B. A weak acid can be concentrated, and a strong acid can be dilute
- C. Strong acids are always concentrated
- D. Weak acids are always dilute
Question 16
Solution X has pH 3 and solution Y has pH 4. How many times greater is the hydrogen ion concentration in X than in Y?
Answer
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