Chapter 105 of 2363 min read
Solubility product and common-ion effect
Why this is asked: The Ksp expression's exponents come straight from dissolution stoichiometry — Ag₂CrO₄ gives [Ag⁺]²[CrO₄²⁻], and dropping that square is the most common setup error. A common ion lowers molar solubility but never changes Ksp itself, which stays constant at a given temperature — a distinction NEET tests by asking what actually changes when a common ion is added.
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