MINERAL SALTS IN ORGANISMS

Introduction: 

In this experiment we will be create the bones and shells more flexibles. 


Materials:
-Some shells

-Bone
-Water
-Acetic Acid
-Tongs
-2x600 Ml Beaker
-Mineral Sals
-Acid Clordric
-Safety goggles
-Gloves

Objectives: 

- Identify mineral salts in organisms.

- Understand the function of inorganic biomolecules in skeletal structures of organisms.

Procedure: 

BONES:

- Examine the flexibility of the bone to compare the result.

- We put the bones inside the beaker.

- We took a beaker and we put: 200ml of water and 200ml of acid acetic or vinegar.

- We cover the beaker to protect the solution with watch glass.

-We need to leave it 24 hores to know what happens to the bone.

SHELLS:

- We took another beaker and put water and calcium carbonate.

- We put inside some shells.

Observations:

BONES:

-The bone is more flexible because it is in contact with the acid and vinagre.
-Lose the ridigity.
SHELLS:

-The shells were floatingn because the shells are less dense than the water.
The reaction is HCL + CaCo3=CO2 + CaCl2

QUESTIONS: 

1. Write the reaction that takes place when the acid acetic reacts with the calcium carbonate?

It formed a single bubble.

2. What is happening the shells are soaking of acetic acid? What are the bubbles you can see?

Bubbles are formed. 

The bubbles are carbon dioxide.

3. What is happening to the bone after some days of soaking it in acetic acid? Why is the bone flexible now?

The bone is more flexible, and leave it the ridigity. 

Because it is in contact with the acid and vinagre.

4. So, what is the function of the calium carbonate in the skeletal structures?

Rigidity.

5. Increases in carbon dioxide to the atmosphere from the burning fossil and deforestation threaten to change the chemistry of the seas. Evidence suggests that this increase in atmospheric carbon dioxide is lowering the pH of the oceans in a process called ocean acidification. How can acidification affects corals reefs?

The reefs coral will be dissolve because the pH will be reduce of the corals.