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At 25 °C, pure water has a pH of 7.
At room temperature (25 °C), a solution with a pH of 3 is…
Solution A has pH 4 and solution B has pH 5. How does A's hydrogen ion concentration compare with B's?
A strong acid solution has [H₃O⁺] = 0.001 M. What is its pH?
At 25 °C, a sodium hydroxide solution has [OH⁻] = 0.01 M. What is its pH?
Air-saturated water has [H₃O⁺] ≈ 2.0 × 10⁻⁶ M from dissolved CO₂. Calculate its pH to two decimal places.
At 80 °C, neutral pure water has a pH of 6.31. A solution at 80 °C has pH 6.5. How should it be described?
Pure water at 100 °C has a pH of about 6.1. Is it acidic? Explain, and state one further reason measured pH can differ from −log[H₃O⁺].
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