Mineral Salts in Organisms

OBJECTIVE:
We want to see how much CaCO3 there is in the bones and in the molusc's shells.

MATERIAL:

• Acid acetic 
• Chicken bones
• Mollusc's shells
• Baker
• Tongs
  

PROCEDURE:
Bones:

1. Carefully clean and cut ad much of the meat away from the chicken thin bone as possible.
2. Examine the flexibility of the bone by trying to bend it with yours fingers.
3. Take a beaker and make and add vinegar.
4. Take the bones and drop them in the vinegar.
5. Leave it 24 hours and see what happens to the bone.
6. Remove the bones from the vinegar with a tong and soak them with water.
7. Write the results in the blog.

Mollusks shells:

1. Take another beaker and make the same vinegar solution.
2. Put inside some shells. 
3. Write the observations in your blog.

RESULTS:
The bones became flexible but not a lot because they have other substances. The mollusks shells became flexibles and someones desintegrated.

QUESTIONS:

1. Write the reaction that takes place when the acid acetic reacts with the calcium carbonate. 
   
   
   
2. What is happening when the shells are soaking of acetic acid? What are the bubbles that you can see? When the shells are soaking of acetic acid or vinegar there's reaction with the CaCO3 and the vinegar. The bubbles I can see 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 become flexible. Is flexible now because the CaCO3 is disolved and now the bone only have colagen.
4. So, what is the function of the calcium carbonate in the skeletal structures? The function of the calcium carbonate in the skeletal structures is make the structures strong
5. Increases in carbon dioxide to the atmosphere from the burning fossil fuels 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 efects corals reefs? The acidification make the corals lose the CO2