Solubility Equilibria Flashcards
What is the Solubility Product Constant?
Ksp
equilibrium constant expression for a dissolution process
Formula for Ksp
Bi2 S3 (s) -><- 2Bi3+ (aq) + 3S2- (aq)
Ksp = [Bi3+]^2 [S2-]^3
Does Dissolution equation contain 1 arrow or 2 arrows?
2 arrows
What are the dissociation equations?
- AgCl (s)
- PbI2 (s)
- Ca3(PO4)2 (s)
- Cr(OH)3 (s)
- Ag2SO4 (s)
- Ag Cl (s) -><- Ag+ (aq) + + Cl- (aq)
- Pb I2 (s) -><- Pb2+ (aq) + 2I- (aq)
- Ca3 (PO4)2 (s) -><- 3Ca2+ (aq) + 2(PO4)3- (aq)
- Cr (OH)3 (s) -><- Cr3+ (aq) + 3(OH)- (aq)
- Ag2 SO4 (s) -><- 2Ag+ (aq) + (SO4)2- (aq)
Relationship between Ksp and Solubility (2)
- Ksp indicates the solubility of an ionic compound
- Direct Relationship
When can Ksp value of salts be compared?
+ Example
When the salts have a similar number of ions in solutions
EXAMPLE:
NaCl (s) -><- Na+ + Cl-
—»> 2 ions
CaCl2 (s) -><- Ca2+ + 2Cl-
—»> 3 ions
Molar Solubility vs Solubility
MS: moles of solute / L of SATURATED solution
S: grams of solute / L of SATURATED solution
What kind of salts have Ksp value?
Only sparingly soluble salts
What are NOT sparingly soluble salts and molecules OR salts and molecules are soluble in water?
Do they have a Ksp value?
NO Ksp value
Salts from Group 1a + Ammonium
Strong acids and bases
Contains (NO)3-
Contains Cl- Br- I-
What is the ion product constant?
Qsp = not at equilibrium yet
MEANING:
Qsp < Ksp
Qsp > Ksp
Qsp = Ksp
unsaturated
supersaturated
saturated
Which of the types of solutions have precipitation?
supersaturated
What is precipitation exactly?
Tira-tirang solute that is not part of the dissolved solution
In precipitation equations, which will be our focus?
why so?
In the sparingly soluble salts
Soluble salts generally do not precipitate under normal conditions because they have high solubility in water.
Relationship between concentration and solubility
Indirect
