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IB DP Chemistry R3.1 L5 | Water Equilibrium and the Ion Product Kw | Lesson Walkthrough

Use water equilibrium and the ion product Kw to relate hydrogen-ion and hydroxide-ion concentrations.

Compare strong and weak acids and bases through extent of ionisation and experimental evidence.

Explain dynamic equilibrium in a closed system and distinguish equal reaction rates from equal concentrations.

Write equilibrium constant expressions from balanced equations and use stoichiometric coefficients as powers.

Calculate equilibrium constants from composition data using careful concentration bookkeeping.

Interpret the magnitude of an equilibrium constant and explore how its value changes when the equation is transformed.

Predict equilibrium shifts caused by concentration, pressure and temperature changes and distinguish these from changes in K.

Use and test small-K approximations, then solve mixed equilibrium-composition problems.

Connect the equilibrium constant with standard Gibbs energy and use the relationship to predict reaction position.

Calculate the reaction quotient and compare Q with K to predict the direction of net reaction.