Why Can't You Melt Salt on a Kitchen Stove?
Part of Ionic Compounds — GCSE Chemistry
This introduction covers Why Can't You Melt Salt on a Kitchen Stove? within Ionic Compounds for GCSE Chemistry. Revise Ionic Compounds in Bonding & Structure for GCSE Chemistry with 20 exam-style questions and 20 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 1 of 12 in this topic. Use this introduction to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 1 of 12
Practice
20 questions
Recall
20 flashcards
📖 Why Can't You Melt Salt on a Kitchen Stove?
An ionic lattice is like a 3D LEGO tower where every piece is glued to its neighbours. Imagine building with red and blue LEGO bricks where every red brick must touch only blue bricks and vice versa. The glue (electrostatic attraction) holds them so strongly that you'd need to heat the whole structure to over 800°C to break it apart. That's why ionic compounds have such high melting points!
When we talked about ionic bonding, we focused on ONE sodium giving ONE electron to ONE chlorine. But here's what really happens when you make sodium chloride: you don't make billions of tiny NaCl "molecules" floating around. Instead, you create something much more impressive — a giant ionic lattice.
Imagine building with LEGO, but instead of random stacking, every single piece must alternate in a perfect 3D pattern. Each Na⁺ ion is surrounded by Cl⁻ ions, and each Cl⁻ is surrounded by Na⁺ ions. Not just next to each other — but above, below, in front, behind, left, and right. This pattern repeats BILLIONS of times in every direction. The result is a crystal — a rigid, geometric structure held together by countless electrostatic attractions.
This is why salt is hard to melt. To melt something, you need to break the structure apart. But in a giant ionic lattice, you're not breaking just one or two bonds — you're fighting against BILLIONS of strong electrostatic attractions all at once! That takes an enormous amount of energy. Salt doesn't melt until 801°C — hot enough to glow bright red!
And here's the electricity puzzle: Salt is made of charged ions, yet solid salt doesn't conduct electricity. Put two wires into a pile of salt, connect it to a battery — nothing happens. But dissolve that salt in water, and suddenly electricity flows! Why? In solid salt, the ions are locked in fixed positions — they can't move to carry the charge. When you melt or dissolve salt, the lattice breaks apart and the ions become free to move. Moving charges = electric current!