Solubility Product Constant Ksp Ksp: review 1)What is the molar mass of H 2 O? 2) How many moles are in 18 g of NaCl? 3) How many g of CaCl 2 are found.

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Presentation transcript:

Solubility Product Constant Ksp

Ksp: review 1)What is the molar mass of H 2 O? 2) How many moles are in 18 g of NaCl? 3) How many g of CaCl 2 are found in 2 L of a 3 M solution of CaCl 2 ? 4) What is the concentration (in mol/L) of K + when 2 L of 1.5 M KCl is mixed with 1 L of 3 M K 2 SO 4 ? Hint: Add together the # mol K + from each source to get total # mol K +. Divide this by total number of L.

Ksp (solubility product) - background 1)Ksp is similar to Kc or Keq 2) It deals with ions instead of gases, 3) one side of the chem. equation has a solid, which is ignored We have used Kc in equilibrium problems “K” indicates an equilibrium “c” indicates units are mol/L (in this course it will also indicate we are dealing with gases)

There are other types of K: Ksp, Kw, Ka, Kb Each subscript immediately indicates some detail about the equilibrium Kw: equilibrium of water, Ka: acid, Kb: base Ksp: equilibrium between solid and ions

Ksp - background The equilibrium between solids and ions is different from the equilibrium between gases The equilibrium between solids and ions is a “phase” equilibrium (e.g. NaCl(aq)) NaCl(s) Na + (aq) + Cl - (aq) Ksp deals with a phase equilibrium: (s)  (aq)

Calculations Types of Questions 1) Determining Individual Ion Concentration from Ksp 2) Determining Ksp values from measured solubilities of ions