12May
2018
0
Grow your own salt crystals

Grow your own salt crystals

Grow your own salt crystals! Salt or sodium chloride (NaCl) crystals are great crystals to try and learn some science too. You can do further research with a microscope once you’re finished.

You need: rock salt, water, clear container, string and pencil (or wood stick).

What to do: make a salt saturated solution (when salt can not be dissolved anymore). The hardest part is to tie a seed crystal (one grain from the rock salt) to the string. Fix the other end of the string to a wood stick and low the seed crystal to the salty solution and wait for crystals to form.

What is happening? As the water evaporates from the solution, the Na and Cl atoms begin to bond together, first as single molecules and then the molecules bond together, forming crystals. The crystal shape for salt is a cube like a six-sided dice.

Salt is not the only crystal you can grow with simple ingredients. If you have a sweet tooth, try to grow a sugar crystal!  You can read all about it in our ‘Sugar crystals‘ post.