Two clear solutions are mixed and Q works out bigger than Ksp. What happens?

• More salt keeps dissolving
• Nothing changes at all
• A precipitate forms

What does the solid itself contribute to the Ksp expression?

• Nothing, the solid is left out
• Its mass in grams
• Its volume in liters

At solubility equilibrium, ions still leave and rejoin the solid at equal rates.

Circle one:   True   False

For magnesium hydroxide the math gives Ksp = 4x cubed. Where do the 4 and the cube come from?

• The solid counts twice in the expression
• One magnesium ion and two hydroxide ions per unit
• Magnesium weighs four times as much

A 1:1 salt has Ksp = 9, so its solubility satisfies x squared = 9. What is x?

Answer: ______________

Extra chloride is poured into a saturated silver chloride solution. What happens to its solubility?

• It rises as chloride pulls ions out
• It falls as equilibrium shifts toward the solid
• It stays exactly the same

A chemist wants silver out of solution but must leave a second metal dissolved. Which trick helps?

• Heat until both metals fall together
• Dilute until Ksp stops applying
• Add a common ion to drop one metal selectively

Q works out below Ksp, but a student predicts a precipitate anyway. What is the error?

• Below Ksp means unsaturated, so nothing precipitates
• Q must be computed before mixing, not after
• Ksp only applies to 1:1 salts