Free interactive chemistry · SIM-SOL-002

Precipitation and Ksp

Mix two ionic solutions. A precipitate forms only when the ionic product Q exceeds Ksp.

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How to use this simulation

Choose a sparingly soluble salt.
Set the cation and anion concentrations after mixing.
Watch for the precipitate and compare Q with Ksp.
See the common-ion graph in the “Common ion” panel.

What to notice

Q > Ksp → precipitate; Q < Ksp → clear solution.
Adding a common ion makes the salt much less soluble.

Try this

Find the lowest anion concentration that just makes a precipitate.

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