Solubility Lesson 4 Calculating Ksp.

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Solubility Equilibria

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Presentation transcript:

Solubility Lesson 4 Calculating Ksp

Refer to your Ksp table on page 333 of your textbook. Ksp (the solubility product constant) is the product of the ion concentrations in a saturated solution raised to the power of their coefficients in the equilibrium. Ksp is indeed a constant. Only temperature changes can change the value of Ksp. The higher the value of Ksp, the higher the solubility. We can find the solubility product constant (Ksp) for certain compounds at 25 ºC Refer to your Ksp table on page 333 of your textbook. Provided for you.

1. The solubility of BaCO3 is 5. 1 x 10-5 M @ 250 C. Calculate the 1. The solubility of BaCO3 is 5.1 x 10-5 M @ 250 C. Calculate the solubility product or Ksp. BaCO3(s) ⇌ Ba2+ + CO32- Ba2+ CO32- BaCO3(s) x x x Ksp = [Ba2+][CO32-] Ksp = [x][x] Ksp = x2 Ksp = (5.1 x 10-5)2 Ksp = 2.6 x 10-9

Ksp Solubility Product Saturated solutions- at equilibrium No Units Increasing Temperature (for endothermic reactions) increases the solubility and therefore, increases the Ksp

Only 2 types of questions Calculate the solubility product, Ksp. Calculate the concentration of the ion/solubility, calculate he mass (that is, how many grams?) etc…

2. The solubility of PbBr2 is 0.012 M @ 25 0C. Calculate the Ksp. dissociation equation PbBr2(s) ⇌ Pb2+ + 2Br- solubility x x 2x equilibrium expression Ksp = [Pb2+][Br-]2 substitute & solve Ksp = [x][2x]2 Ksp = 4x3 Ksp = 4(0.012)3 Ksp = 6.9 x 10-6 Note that the Br- is doubled and then squared!

3. If 0. 00243 g of Fe2(CO3)3 is required to saturate 100 3. If 0.00243 g of Fe2(CO3)3 is required to saturate 100.0 mL of solution. What is the solubility product? Fe2(CO3)3 ⇌ 2Fe3+ + 3CO32- x 2x 3x Ksp = [Fe3+]2[CO32-]3 Molarity = 0.00243 g x 1 mole 291.6 g Ksp = [2x]2[3x]3 0.100 L Ksp = 108x5 = 8.333 x 10-5 M Ksp = 108(8.333 x 10-5)5 Ksp = 4.34 x 10-19

TRY If 0.0047 g of Fe(OH)3 is required to saturate 200.0 mL of solution. What is the solubility product?

What if you are asked to find ion concentrations/solubility or mass?

Calculate the molar solubility of iron(II) hydroxide from its Ksp. Write dissociation equation Find corresponding Ksp expression

TRY: what mass is dissolved in 275 mL of saturated silver bromate?

Last few tips Don’t ever start a question without writing the dissociation equation first. Don’t forget to BALANCE this equation. Don’t forget to use your coefficients as powers in Ksp equation Use molar mass when converting from gramsmoles or moles grams.

Homework: Try ALL of these questions Homework: Try ALL of these questions! Hebden: Pg 95 #43, 44, 46, 47, 49, 50, 52, 55