pH & Acid-Base

pH measures how acidic or basic a solution is, on a logarithmic scale defined as pH = −log₁₀[H⁺], where [H⁺] is the hydrogen ion concentration in mol/L — each whole step on the pH scale represents a tenfold change in [H⁺]. At 25°C, water’s own ion product Kw = [H⁺][OH⁻] = 1.0×10⁻¹⁴ (mol/L)² (the IUPAC-recommended reference value, e.g. the CRC Handbook of Chemistry and Physics) gives the simple relationship pOH = 14 − pH used throughout this simulation. A solution is acidic when pH < 7, neutral at pH = 7 (pure water), and basic when pH > 7 — all computed by `@scienceverse/simulations-core`’s real, tested `ph` model, not an approximation invented for this page.

A second panel models acid-base neutralisation stoichiometry for a monoprotic strong acid and a monobasic strong base: at the equivalence point, moles of acid equal moles of base (acidConcentration × acidVolume = baseConcentration × requiredBaseVolume), so the simulation solves directly for the base volume needed to exactly neutralise a given acid sample — standard general-chemistry stoichiometry, the same equation taught for titration calculations. Four parameters — solution pH (a real conversion via the model’s own [H⁺]/pH relationship, not a separate approximation), acid concentration, acid volume, and base concentration — are each adjustable within a scientifically valid range. Every recomputation runs in a dedicated Web Worker, off the page’s main thread. A shareable link captures the exact current parameters. Readers whose browser cannot run canvas rendering, who prefer reduced motion, or who have JavaScript disabled see the real computed values below instead, in an accessible data table.

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