Thames & Kosmos Kids First: Crystals, Rocks & Minerals handleiding

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Thames & Kosmos

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Handleiding

WHAT’S HAPPENING

Calcite is a chemical compound of the element calcium with

carbonic acid. Strong acids, such as the warm citric acid, release

the carbonic acid in the form of carbon dioxide, hence the

effervescence. This chemical test is used to identify minerals.

Be careful

when

handling the

sharp knife!

10 ml

TIP !

If no gas bubbles are released, then you

might have the wrong mineral. Repeat

steps 4 and 5 again with a different

mineral from the bag. Or take the

limestone from the second bag and try

the experiment with that.

Telltale gas

production

YOU WILL NEED

› Small measuring cup

› Double-ended measuring spoon

› Pipette

› Citric acid

› Mineral calcite

› Limestone

› Magnifying lens

› Wooden spatula

› Water

› Old glass jelly jar

› Penknife

› Hot water in a pot

HERE’S HOW

1. Dissolve three small spoonfuls of citric acid

in 10 ml of water in the jelly jar.

2. Place the jelly jar in the pot of hot water.

Stir until everything is dissolved.

3. Find the calcite specimen in the bag of

minerals. It is a milky, whitish mineral —

not to be confused with the transparent

quartz crystal.

4. Scrape a few small chunks off of the calcite

and place them in the small measuring cup.

5. Drip the warm citric acid solution over the

calcite pieces with the pipette. Observe with

the magnifying lens how little gas bubbles

are released from the calcite chunks.

1 2

For citric acid, note the

information about hazardous

substances on page 6.

Important:

For all of the

experiments, wear

your safety goggles!

EXPERIMENT 13

Minerals in the Research Lab

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