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Calibrating instruments…
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Acids, bases and the pH bench — titration curves, buffers and Ka.
Water quietly splits into H⁺ and OH⁻, and everything acidic or basic is a story about their balance. These simulations put a pH meter and a burette in your hands: titrate a strong or weak acid against a base and watch the pH curve climb through its buffer plateau to a sharp equivalence jump, read the pKa straight off the half-neutralisation point, and see an indicator flip colour exactly where it should.
Beyond the open showcase, subscribed schools get the growing library of Ionic Equilibrium experiments — searchable, tagged by concept and difficulty, and expanding continuously.