Beaker Lane Curves

Beaker Lane Curves is a quiet paper laboratory for one thing: the titration curve. Drag the burette tap, let the titrant fall, and the curve draws itself as the pH is solved fresh at every volume. Nothing is canned and nothing is replayed from a stored table. THE BENCH Pick your analyte - a strong acid, a weak acid, a strong base, a weak base, or a diprotic acid with two steps. Set both concentrations and the flask volume, and the curve reshapes instantly around them. Open the tap by dragging it and the pour runs millilitre by millilitre while the flask swirls and the chart grows. Equivalence, half-equivalence and the shaded buffer region are marked on the curve automatically, so the shape stops being a picture and starts being something you can read. INDICATORS Choose one of eight indicators and the flask colour flips over its real transition range. Then call the endpoint yourself: stop the tap where you think the colour has turned, and the app shows the miss in millilitres against the true equivalence volume. A badly chosen indicator flips early, and the size of that error is exactly what you see. PRACTICE Short generated tasks ask you to choose a suitable indicator, read a pKa straight off the half-equivalence point, and name the analyte hiding behind an unlabelled curve. Every task is checked before it is shown, so the answer is unique and the curve behind it is real. AWARDS Nine bench marks track your pours, your precision and your practice streaks across launches, so progress carries over from one session to the next. WHAT MAKES IT DIFFERENT - Every point computed, nothing canned: pH from a full charge and mass balance - Strong and weak acids, weak bases and a diprotic analyte with two steps - Eight indicators with their real transition windows drawn on the curve - Equivalence, half-equivalence and the buffer region marked automatically - Works completely offline with no ads, no accounts and no permissions UNDER THE GLASS The solver is a plain engine with no shortcuts. Each pH is the root of the solution's charge balance, bracketed and squeezed by bisection until it settles; fractional dissociation comes from the stepwise acid constants, so weak, strong and diprotic analytes all fall out of a single equation. Endpoint volumes are found by a second search over volume. On launch the app measures itself against textbook landmarks - strong against strong meeting at pH 7.00, a 0.100 M strong acid at pH 1.00, half-equivalence equal to pKa - and reports the result on the How tab, so you can see that the numbers you are reading are sound. Five tabs: Bench, Practice, Indicators, How and Awards. This is a paper simulation. There is no procedure, no apparatus and no safety guidance - only the chemistry of the curve. Fully offline. No ads. No sound. No internet connection, no accounts, no permissions.