How to use the coulomb lattice energy estimate calculator
Estimate ionic lattice attraction energy. Enter cation charge, anion charge, ion separation in the fields above; the coulomb energy per ion pair is computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- z1 — Cation charge
- z2 — Anion charge
- r — Ion separation (pm)
Worked example
With cation charge = 1, anion charge = 1, ion separation = 282 pm, the calculator gives coulomb energy per ion pair ≈ -492.6789 kJ/mol.
Frequently asked questions
What is the formula for the coulomb lattice energy estimate calculation?
Coulomb energy per ion pair (kJ/mol) = -KE × z1 × z2 × QE × QE / (r × 1e-12) × NAV / 1000. Here z1 is cation charge, z2 is anion charge, r is ion separation (pm).
What inputs do I need for the coulomb lattice energy estimate calculator?
You need cation charge, anion charge, ion separation in pm. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.