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Unit III: Solubility Equilibrium. Calculating Solubility. Calculating Solubility. Example 1 It is experimentally found that 1L of saturated AgBrO 3 (aq) contains 1.96 g of AgBrO 3 . What is the molar solubility of AgBrO 3 ?. Calculating Solubility. Example 2

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Unit III: Solubility Equilibrium


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unit iii solubility equilibrium

Unit III: Solubility Equilibrium

Calculating Solubility

calculating solubility
Calculating Solubility

Example 1

It is experimentally found that 1L of saturated AgBrO3 (aq) contains 1.96 g of AgBrO3. What is the molar solubility of AgBrO3?

calculating solubility1
Calculating Solubility

Example 2

The molar solubility of PbI2 is 1.37 x 10-3 M. Express this value in grams per litre.

calculating solubility2
Calculating Solubility

Example 3

It is experimentally found that 250 mL of saturated CaCl2 contain 18.6 g of CaCl2. What is the solubility of CaCl2?

calculating solubility3
Calculating Solubility

Example 4 (Hebden p. 78 #15)

A chemistry student was assigned the task of determining the solubility of potassium chloride, KCl. She added an excess of solid KCl to water, stirred, and let the solution sit overnight. The next day, she pipetted a 25.00 mL portion of the saturated solution into a pre-weighed evaporating dish, determined the combined mass, carefully boiled off the water present, allowed the residue to cool and re-determined the mass of the evaporating dish and residue. The data obtained is given below.

calculating solubility4
Calculating Solubility
  • Temperature of solution = 22.5ºC
  • Mass of evaporating dish = 54.87 g
  • Mass of solution and evaporating dish = 84.84 g
  • Mass of residue and evaporating dish = 62.59 g

Calculate:

  • The mass of 25.00 mL of the solution.
  • The mass of KCl in 25.00 mL of solution.
  • The mass of water in 25.00 mL of solution.
  • The mass of KCl which can dissolve in 100.0 g of water at 22.5ºC.
  • The molar solubility of KCl, expressed in moles of KCl per litre of solution.
calculating ion concentrations
Calculating Ion Concentrations

Example 5

Calculate the concentration of all ions in each of the following solutions.

a) 2.5 M CaCl2

calculating ion concentrations1
Calculating Ion Concentrations

Example 5 (continued)

Calculate the concentration of all ions in each of the following solutions.

b) 0.68 M Al2(SO4)3

calculating ion concentrations2
Calculating Ion Concentrations

Example 5 (continued)

Calculate the concentration of all ions in each of the following solutions.

c) 8.0 g of KBr in 500 mL

calculating ion concentrations3
Calculating Ion Concentrations
  • It will also be necessary to take into account the dilution that occurs when solutions of ions are mixed with water or each other.

C1V1 = C2V2

calculating ion concentrations4
Calculating Ion Concentrations

Example 6

Calculate the concentration of all the ions present when: 

a) 150 mL of water is added to 125 ml of 0.25 M Cl-

calculating ion concentrations5
Calculating Ion Concentrations

Example 6 (continued)

Calculate the concentration of all the ions present when: 

b) 25.0 mL of 0.200 M Ag+ is added to 55.0 mL of 0.500 M NO3-

calculating ion concentrations6
Calculating Ion Concentrations

Example 6 (continued)

Calculate the concentration of all the ions present when: 

c) 15.0 mL of 0.75 M MgCl2 is mixed with 30.0 mL of 0.60 M CaBr2

calculating ion concentrations7
Calculating Ion Concentrations

Example 6 (continued)

Calculate the concentration of all the ions present when: 

d) 65.0 mL of 0.450 M AgNO3 is mixed with 80.0 mL of 0.900 M Ba(NO3)2