Solubility Written Response
January 1999
3. In an experiment to determine the solubility of barium fluoride, 500.0mL of the
saturated solution was heated in an evaporating dish to remove the water. The
evaporating dish and residue were heated two more times, to ensure all the water had
been driven off.
Using the data above, calculate the Ksp for BaF2 .
(4 marks)
April 1999
4. A 100.0mL sample of 0.600 M Ca(NO3)2 is diluted by adding 400.0mL of water.
Calculate the concentration of ions in the resulting solution.
(2 marks)
5. A maximum of 0.60g Pb(NO3)2 can be added to 1.5 L of NaBr(aq) without forming a
precipitate. Calculate the [NaBr]
(4 marks)
June 1999
4. Write the net ionic equation representing the reaction that occurs when
50.0mL of 0.20M ZnSO4 and 50.0mL of 0.20M BaS are combined.
(2 marks)
5. When 1.00g of MgCO3 is added to 2.0L of water, some, but not all, will dissolve to
form a saturated solution. Calculate the mass of solid that remains undissolved.
(4 marks)
August 1999
4. The solubility of Mn(IO3)2 is 4.8 x 10-3 mol/L.
a) Write the net ionic equation that describes a saturated solution of Mn(IO3)2 .
(1 mark)
b) Calculate the concentrations of the ions in a saturated solution of Mn(IO3)2 .
(1 mark)
5. Consider the following saturated solutions at 25° C:
Using calculations, identify the solution with the greater [Ag + ]
(5 marks)
January 2000
5. a) Write the balanced formula equation for the reaction between Na3PO4(aq) and
CuCl2(aq). (1mark)
b) Write the net ionic equation for the reaction between Na3PO4(aq) and CuCl2 (aq).
(1 mark)
6. A saturated solution of nickel carbonate, NiCO3, contains 0.090g in 2.0L of solution.
Calculate Ksp for NiCO3.
(3 marks)
April 2000
5. Calculate the maximum concentration of Pb+2 that can exist in 3.0 X10 –2 M Na2SO4
without forming a precipitate. (2 marks)
6. Consider the following:
a) Which two solid samples could be added to the CaS solution in order to remove first
one ion and then the other from the solution. Indicate the order in which to add them. (2
marks)
First add:______________________
Then add:______________________
b) Write the net ionic equation for one of the precipitation reactions in part (a). (1 mark)
June 2000
4. At 20°C, will a precipitate form when 25.0mL of 0.010M Pb(NO3)2 is combined with
75.0mL of 0.010M NaI? Support your answer with calculations. (3 marks)
5. When HCl is added to a saturated solution of CuC2O4, some precipitate dissolves.
However, when HCl is added to a saturated solution of PbCl2, additional precipitate
forms.
Explain these observations. Support your explanation with chemical equations.
(3 marks)
August 2000
4. a) Write the complete ionic equation for the reaction between NaBrO3 and AgNO3. (1
mark)
b) What is the maximum [NaBrO3]
marks)
that can exist in equilibrium with 2.0M AgNO3? (2
January 2001
4. Write the balanced complete ionic equation for the reaction that occurs when 0.20M of
Ba(NO3)2 is added to an equal volume of 0.20M Na2CO3. (2 marks)
5. Calculate the minimum number of moles of Pb(NO3)2
in 50.0mL of 0.15M ZnI2. (5 marks)
required to start precipitation
April 2001
4. In a titration, 25.00mL of NaCl(aq ) reacts completely with 42.20mL of 0.100M
AgNO3. What is the [Cl -] in the original solution?
(3 marks)
5. The following data was obtained when 20.0mL of a saturated solution of PbI2 was
evaporated to dryness.
Use this information to determine the Ksp of PbI2 .
(4 marks)
June 2001
4. Calculate the molar solubility of SrF2.
(4 marks)
5. Does a precipitate form when 3.0mL of 1.0 X 10-3 M NaBr is added
to 2.0mL of 1.0 X 10-3 M Pb(NO3)2?
(4 marks)
August 2001
4. Hard water, containing Ca+2 ions, forms a precipitate with sodium stearate
(NaC18H35O2).
a) Write the net ionic reaction that represents this precipitation. (2 marks)
b) Identify another compound that could be used to remove Ca+2 from hard water. (1
mark)
5. Calculate the mass of SrCO3 dissolved in 1.00L of a saturated solution of SrCO3. (3
marks)
Solubility Written Response Answers
January 1999
3)
April 1999
4)
5)
June 1999
4)
5)
August 1999
4a)
b)
5)
January 2000
5a)
b)
6)
April 2000
5)
6a)
b)
June 2000
4)
5)
August 2000
4a)
b)
January 2001
4)
5)
April 2001
4)
5)
June 2001
4)
5)
August 2001
4a)
4b)
5)