Recrystallization And A Question

Hello Everyone,

This time I’ve tried making a time lapse of NaCl getting recrystallized. I have used dark field here to make the crystals look more prominent.

Here are the steps I followed:

1. Prepare a saturated solution of NaCl I.e adding NaCl to water till it stops dissolving.

2. Put a drop of this solution on the slide and add a coverslip on top.

Now instead of observing it directly let it stand for a while till a few nuclei are formed.

Once you have a few observable points of crystallization, focus on the edge of the crystal and set up a time lapse 🙂

This can be an easy way to demonstrate school students how solar salt is formed. A very simple experiment as such but foldscoping it could intrigue the kids and make them get a feel for how beautiful such a simple phenomenons can be 🙂

Here’s the video!

Next I’m going to do a time lapse of NaCl getting crystallized on the surface of a semi solid medium.I’ve noticed that saturated salt media having agar tends to form pyramidal crystals of NaCl over it. I wonder why it forms that particular shape? Would you help me find an answer?

~Have Fun Foldscoping ^_^

Mitali Patil

Second Year Undergrad

Ramnarain Ruia Autonomous College, Mumbai.

2 Comments Add yours

  1. laksiyer says:

    Fantastic time lapse @Mitali. Try hanging drop, that way the surface wont influence the crystal shape as much. Would love to see the pyramidal crystals before commenting.

  2. Mitali says:

    @Laks sir I tried the hanging drop method but for some reason it did not work as expected. I shall try using ditch slides with saturated salt media next!

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