UNIT III Tutorial 10: Ksp Calculations

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Presentation transcript:

UNIT III Tutorial 10: Ksp Calculations

Objectives In this Tutorial you will be shown: What is meant by Ksp . How to write a "Ksp expression" from a net ionic equation. How to calculate the solubility of an ionic substance in moles/L or in grams/L, given the value of Ksp . How to calculate the value of Ksp , given the solubility of an ionic substance.

What is Ksp? Ksp is the equilibrium constant (Keq) for an ionic substance dissolving in water. Ksp stands for “Solubility Product Constant.” Example 1: Given: CaCO3(s) ↔ Ca2+(aq) + CO32-(aq). The equilibrium constant expression for this reaction is: Ksp = [Ca2+] [CO32-] (Remember that the [CaCO3] is not included in the expression because it is a solid.)

Ksp Expression Example 2: Write the Ksp expression for the following net ionic reactions: PbCl2(s) ↔ Pb2+(aq) + 2Cl-(aq) Ag2SO4(s) ↔ 2Ag+(aq) + SO42-(aq)

Ksp → Solubility Example 3 Calculate the molar solubility of AgCl.

Ksp → Solubility Example 4 Calculate the molar solubility of SrF2.

Ksp → Solubility Example 5 Calculate the solubility of Ag2CO3 in g/L.

Solubility → Ksp Example 6 The solubility of Ag2CrO4 in water is 1.31 x 10-4 M. Calculate the value of Ksp.

Solubility → Ksp Example 7 At a certain temperature, the solubility of SrCO3 is 7.5 x 10-5 M. Calculate the Ksp for SrCO3.

Solubility → Ksp Example 8 6.60 grams of MnF2 will dissolve in one litre of solution at 25°C. Calculate the value of Ksp for MnF2 at 25°C.

Assignment Hebden Textbook p. 90-95 Questions #40-55