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Testing for Calcium Carbonate

Day 21
by

Summer Roland

on 29 May 2014

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Transcript of Testing for Calcium Carbonate

Day 21 - Testing for Calcium Carbonate
Why did we blow air into the limewater?




What were the results of blowing air into the limewater?
The limewater represented ancient sea water and the blowing air (bubbles) into the water represented ancient sea creatures exhaling carbon dioxide into the water.
Blowing air into the limewater created a cloudy substance that settled to the bottom of the cup in a layer.
We are looking for materials in the ocean environment that might cause a fizzing when acid is placed on it. Remember some possible materials were:
Animal (fish, whales, etc)
Bones and scales of dead animals
Shells and corals
Seaweed, wood, leaves, and other plant material
I have some of these materials in these trays.
Plan an investigation to see if any of these materials might create the fizz in limestone.
Making a chart will help you.
Test and Record your results.
How do you think limestone forms?

What process of sedimentation might produce a rock that fizzes with dilute acid?
-> Limestones fizz in acid because they contain calcite.
-> Calcite is one form of calcium carbonate.
-> When acid reacts with calcium carbonate, carbon dioxide gas is given off.
-> The fizzing is the CO being released.
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-> The question the scientists wanted to know was, "Where does the calcium carbonate come from and how does it get into the limestone?"
-> Calcium carbonate does not dissolve in pure water, so if it forms in the sea or falls into the sea, it will sink to the bottom.
-> It forms a layer on the bottom. If the layer eventually turns into rock, the rock is limestone.
-> Calcium carbonate forms in the sea in two main ways.
1. Some animals use calcium to make their bones, shells, and scales.
The calcium in shells combines with carbon and oxygen to make CaCO .
When the animals die, the calcium settles to the bottom and can be incorporated into the forming rock.
In some places shells, like the oyster shells we tested, are the main component in the limestone.
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2. Calcium carbonate forms when CO , exhaled by creatures living in the sea, reacts with calcium in the water.
In this case, the calcium carbonate forms right in the water and precipitates to the bottom.
We saw that happen in our cups.
Answer the questions above.
READ: Where in the World is Calcium Carbonate?

ANSWER: Discussion Questions pg. 365
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ANSWER: Basin Questions
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