L2- Minerals salts in organisms.

Introduction:

We will dissolve calcium carbonate scallops and an eggshell. We will also put chicken bones in vinegar, to dissolve organic matter in them.

Objectives:

• Identify mineral salts in organisms.
• Understand the function of inorganic biomolecules in skeletal structures of organisms.

Hypothesis:

• Acetic acid dissolved organic matter and egg shells. It also dissolves M.O. bone, and that means that the bone can bend.

Materials:

1. Some molluscs' shells (mussels, eggs).
2. Dried, cleaned chicken bones.
3. Water.
4. Acetic Acid / Vinaguer.
5. Tongs.
6. 2x200mL Beaker.
7. Clock glass.
8. Distilled water.

Procedure:

• Add a chicken bone in a beaker with 200 mL of vinegar. Like before you put it in the weigh (in our weight 16.6 grams). Once inside, the cover it, and let the acidic vinegar dissolved organic matter. Hopefully a week and see that they afraid to bend.
• Add an egg shell and a shell in a beaker. Adding a large amount of acetic acid and let this digolgui calcium carbonate bearing the egg shell. We leave a couple of days, and once after this time, we realize that the acid has dissolved all the eggshell and shell.

Comments:

• To dissolve the egg shell, we can see bubbles coming out. These bubbles are CO2.

Conclusions:

• The acid dissolves calcium carbonate and organic matter. The dissolved organic matter of the bone, which makes this can be doubled.

Questions:

1. CH3COOH + CaCO3 ----------- CO2(g) + 
2. Releases CO2
3. The bone can be doubled. Because the acid is dissolved organic matter.
4. The rigidity.