To find:
The most negative lattice energy substance out of (a) KCl, (b) TiO2, (c) BaCl2, (d) KI
Answer to Problem 4.27QA
Solution:
TiO2 has the most negative lattice energy.
Explanation of Solution
1) Concept: Using the formula below, we can calculate the lattice energy. Here,
Ionization reactions for all four compounds:
2) Formula:
3) Given information: Ionic radii of ions are:
Ions | Ionic radius |
K+ | 138 pm |
Cl- | 181 pm |
Ti+2 | 100 pm |
O-2 | 140 pm |
Ba+2 | 149 pm |
I- | 206 pm |
4) Calculations: The distance between nuclei of cation and anion is calculated as
And so, for the rest of compounds:
Now product of charges for all compounds
When the factor
Conclusion:
TiO2 has the most negative lattice energy because the product of the charges is the highest.
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Chapter 4 Solutions
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