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DISSOLUTION PROCESS OF IONIC PRODUCT
Based on the data given below:
(i) Construct energy cycle diagram to represent the dissolution of NaCl(ii) Calculate the lattice energy of NaCl
[ ANS: -776 kJ mol-1]
Page 1
QUESTION1
DISSOLUTION PROCESS OF IONIC PRODUCT
Based on the data given below:
(i) Construct energy cycle diagram to represent the dissolution of LiCl(ii) Calculate the lattice energy of LiCl
[ ANS: -1000 kJ mol-1]
Page 2
QUESTION2
DISSOLUTION PROCESS OF IONIC PRODUCT
Tutorial Question 18: Page 12 ( THERMOCHEMISTRY)The lattice energy of NaCl is -776 kJ mol-1 and the enthalpy change when 1 mole
of solid NaCl dissolved in water is +4 kJ mol-1. If the enthalpy of hydration of Na+
is 390 kJ mol-1, calculate the enthalpy of hydration of Cl- in the dissolution process
of NaCl using the energy cycle. [ ANS: -382 kJ mol-1]
Page 3
QUESTION3
DISSOLUTION PROCESS OF IONIC PRODUCT
Tutorial Question 19: Page 12 ( THERMOCHEMISTRY)The lattice energy for potassium fluoride is -821 kJ mol-1 and its enthalpy of
hydration is -819 kJmol-1. Calculate enthalpy of solution for potassium fluoride.
[ ANS: +2 kJ mol-1]
Page 4
QUESTION4
DISSOLUTION PROCESS OF IONIC PRODUCT
Past Year MST 2011/2012Based on the data given in TABLE 1, construct an energy cycle diagram for
dissolution of lithium chloride, LiCl.
TABLE 1
Page 5
Process Enthalpy of reaction (kJmol-1)
Lattice energy of LiCl ΔH = -846
Dissolution of LiCl ΔH = -77
Hydration of Li+ ΔH =-510
Hydration of Cl- ΔH =-413
QUESTION5
DISSOLUTION PROCESS OF IONIC PRODUCT
Past Year MST 2012/2013The enthalpy of solution for calcium chloride crystal is -81.3 kJ mol-1. The lattice energy of CaCl2 is -2249 kJ mol-1. Using an energy cycle method, calculate the enthalpy change for the reaction below:
[ANS: ]
Page 6
QUESTION6
DISSOLUTION PROCESS OF IONIC PRODUCT
Past Year PSPM 2 2012/2013Calculate the enthalpy of hydration of Cl- in the dissolution process of LiCl in water using energy cycle method.
Given:
Lattice energy of LiCl = -846 kJ mol-1
Enthalpy of solution of LiCl in water = -37 kJ mol-1
Enthalpy of hydration of Li+ = -510 kJ mol-1
[ANS: ]
Page 7
QUESTION7
DISSOLUTION PROCESS OF IONIC PRODUCT
Given :
(a) Name each of these three enthalpy changes.(b) Suggest a reason why enthalpy of hydration are exothermic processes?(c) Write an equation, including state symbols, for the enthalpy change
of solution of NaF.(d) Using energy cycle method, calculate the enthalpy change of solution of NaF.
[ ANS: +71 kJ mol-1]
Page 8
QUESTION8
DISSOLUTION PROCESS OF IONIC PRODUCT
Based on the data given below:
(i) Construct energy cycle diagram to represent the dissolution of NaCl(ii) Calculate the lattice energy of NaCl
SOLUTION:
Target equation:Using Hess’s Law
reverse(ii) + (i)
Using Energy Cycle Method
Page 9
QUESTION1
DISSOLUTION PROCESS OF IONIC PRODUCT
Based on the data given below:
(i) Construct energy cycle diagram to represent the dissolution of LiCl(ii) Calculate the lattice energy of LiCl
Target equation:Using Hess’s Law
reverse (ii) + (i)
Using Energy Cycle Method
Page 10
QUESTION2
DISSOLUTION PROCESS OF IONIC PRODUCT
Target Equation
Using Hess’s Law
(i)+(ii)
-772 – (-390)
Page 11
QUESTION3
DISSOLUTION PROCESS OF IONIC PRODUCT
Using Energy Cycle Method
SOLUTION:
Target Equation:
Using Hess’s Law
reverse (i) + (ii)
Using Energy Cycle Method
Page 12
QUESTION4
DISSOLUTION PROCESS OF IONIC PRODUCT
Past Year MST 2011/2012SOLUTION:
Target Equation:
Using Hess’s Law
reverse (i) + (ii)
J
Page 13
QUESTION5
DISSOLUTION PROCESS OF IONIC PRODUCT
Using Energy Cycle Method
Past Year MST 2012/2013SOLUTION:
Target Equation:
J
Using Hess’s Law
reverse (ii) + (i)
J
Page 14
QUESTION6
DISSOLUTION PROCESS OF IONIC PRODUCT
Past Year PSPM 2 2012/2013
Target Equation:
J
Using Hess’s Law
(i) + (ii)
J
Page 15
QUESTION7
DISSOLUTION PROCESS OF IONIC PRODUCT
Using Energy Cycle Method
SOLUTION:
Target Equation:Using Hess’s Law
reverse (i) + (ii)
Page 16
QUESTION8
DISSOLUTION PROCESS OF IONIC PRODUCT
Using Energy Cycle Method
Page 17
