Common Ion Effect and Precipitation

Question 1

What is precipitation?

Answer 1

o Precipitation is when a solid solute spontaneously forms from a solution

Question 2

Describe the result when the Qsp > Ksp

Answer 2

precipitate will form

Question 3

Describe the result when the Qsp < Ksp

Answer 3

no precipitate will form

Question 4

What is a super-saturated solution?

Answer 4

 A solution with a concentration higher than the saturation concentration is called a super-saturated solution

Question 5

Relate Qsp to Ksp when the system is at equilibrium

Answer 5

Qsp = Ksp

Question 6

How do you make a super-saturated solution?

Answer 6

 Made by making a saturated solution at a higher temperature where the solubility is higher and then slowly cooling the solution to a lower temperature where the solubility is lower

Question 7

What is the common ion effect?

Answer 7

o Because the solubility of an ionic compound depends on the product of the concentrations of the ions, this solubility can be greatly affected if there are already some of those ions present in the solution

Question 8

Relate Qsp to Ksp when no precipitate will form

Answer 8

Qsp < Ksp

Question 9

Relate Qsp to Ksp when precipitate will form

Answer 9

Qsp > Ksp

Question 10

Describe the result when the Qsp = Ksp

Answer 10

the system is at equilibrium