pH measures the amount of H⁺ ions in a solution on a 0–14 logarithmic scale: below 7 is acidic (more H⁺), 7 is neutral, above 7 is basic (more OH⁻). Each pH unit = a 10× change in H⁺ concentration.
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Drip acid/base or drag the pH slider on the right · watch the solution change colour, the H⁺/OH⁻ ion ratio shift, and the marker slide along the pH scale · click a concept for details
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Titration curve: pH vs. volume of base addedpHpH 7 (equivalence)