Solubility and Complexation Equilibria

Chapter 18

Is AgCl soluble or insoluble?

Dissolution Reactions and Ksp Expressions

AgCl(s)

Mg(OH)2(s)

Ca3(PO4)2(s)

Standard Reaction Types:

Determining Ksp Experimentally

The solubility of PbF2 is found to be 0.525 g/L. What is Ksp?

+ - + - -10AgCl(s) Ag (aq) + Cl (aq) Ksp = [Ag ][Cl ] = 1.8 10

Predicting Solubility

2+ 3-3 4 2 4

2+ 3 3- 2 -33sp 4

Zn (PO ) (s) 3 Zn (aq) + 2 PO (aq)

K = [Zn ] [PO ] = 9.1 10

3+ - 3+ - 3 -393FeCl (s) Fe (aq) + 3 OH (aq) Ksp = [Fe ][OH ] = 2.0 10

Can you eyeball rank solubilities?

AgCl

AgBr

AgCl

CaF2

Standard Types

Determining if a precipitation will occur:

Determining if a precipitation will occur:

If 5.0 mL of 1.0 x 10-3 M NaCl is added to 1.0 mL of 1.0 x 10-3 M Pb(NO3)2, will solid PbCl2 (Ksp = 1.7 x 10-5) precipitate? If a precipitate will not form, what chloride ion concentrationwill cause a precipitate of lead chloride to form?

Determining if a precipitation will occur:

If 5.0 mL of 1.0 x 10-3 M NaCl is added to 1.0 mL of 1.0 x 10-3 M Pb(NO3)2, will solid PbCl2 (Ksp = 1.7 x 10-5) precipitate? If a precipitate will not form, what chloride ion concentrationwill cause a precipitate of lead chloride to form?

Common Ion Effect: The presence of an ion common to asolubility equilibrium will decrease solubility of the salt.

Will PbCl2 be more soluble in pure water or in a 0.200 M NaCl solution?

Common Ion Effect: The presence of an ion common to asolubility equilibrium will decrease solubility of the salt.

What is the solubility of PbCl2 in pure water and in a 0.200 M NaCl solution? (Ksp = 1.7 x 10-5)

Common Ion Effect: The presence of an ion common to asolubility equilibrium will decrease solubility of the salt.

What is the solubility of PbCl2 in pure water and in a 0.200 M NaCl solution?