Chemistry / Chem 1533 · Atom · ~20 seconds
Saturated, Unsaturated, and Supersaturated Solutions
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State
A solution is saturated at its solubility limit, unsaturated below it, and supersaturated above it in an unstable, nonequilibrium state.
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A hand warmer's sodium acetate solution stays supersaturated until disturbed, then rapidly precipitates the excess and releases heat.
Watch for
A supersaturated solution is not at equilibrium and can be disturbed into sudden precipitation of its excess solute.