Thames & Kosmos Ooze Labs: Chemistry Station handleiding

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Growing salt crystals

If you study salt and sugar under the

magnifying lens, you will see little cube-shaped

crystals (salt) or crystals with slanted edges

(sugar). With a little patience and care, you will

be able to make larger salt crystals that are

particularly beautiful.

YOU WILL NEED

Large measuring cup, filter paper, funnel, wide

test tube, chemistry station, petri dish with lid,

measuring spoon, tweezers, water, screw-top

jar, salt (ideally rock salt, pure sea salt, or

dishwasher salt), rock sugar, labels

HERE’S HOW

1. Fill the large measuring cup with about 25

ml of water. While stirring, dissolve so much

salt in it that some remains undissolved on

the bottom of the cup.

2. Assemble a filter out of filter paper.

3. Filter the salt solution into the wide test tube

and fill the petri dish halfway with the

filtrate. Set the dish in a quiet place and cover

it with a piece of filter paper.

4. After one to two days, crystals will separate

out of the solution and accumulate on the

bottom of the dish. To make larger crystals,

remove the prettiest ones with the tweezers

and place them in the lid of the petri dish.

Filter the remaining solution again through a

filter into a test tube.

5. Add this solution to the large crystals in the

petri dish lid. Set the lid in a quiet place

again. This way, you will eventually get big,

beautiful crystals. Compare their shape with

that of the rock sugar.

6. Dispose of residues in the household garbage.

“Filtrate” is

the name for

the filtered

liquid.

WHAT’S HAPPENING

If water evaporates out of a saturated salt

solution, the solution will end up with an

excess of salt. That gradually results in

the formation of little cube-shaped salt

crystals. If you regularly remove the

smallest secondary crystals and keep

using only the bigger ones, you can grow

beautiful crystals.

› › › EXPERIMENT 18

Ooze Labs Chemistry Station

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