The rubber bone experiment is a classic scientific investigation that teaches how important calcium is to having a strong and healthy skeletal system, as well as the acidic properties of vinegar.

Calcium and phosphate minerals combine to keep bones strong and rigid. 

Chemical Reaction With Bone and Acid 

The acid component of vinegar reacts with calcium compounds in bones, making the calcium soluble so that the water component of vinegar can then dissolve the calcium from the bones, leaving the bone less rigid and able to bend. 

More in-depth………

The acetic acid in vinegar and calcium carbonate in chicken bones react together to produce calcium acetate -- a calcium salt that is soluble in water -- and carbonic acid.

 When calcium acetate is formed, it diffuses out of the bones and into the water component of the vinegar. 

What you should observe…

Carbonic acid is not stable at room temperature, and it immediately breaks down into water and carbon dioxide gas, which is released as small bubbles that can be seen if the bones are watched closely over time….

Your Experiment…

 3 labelled jars

1.    Water (control)

2.    One with vinegar

3.    One with coke… extension experiment…on day seven, need all bones from jar one and two, kept in their solution   see instructions at the end.

 

Chicken thigh bones…. (3) or two if not doing extension coke experiment….….
 Use either raw or cooked chicken  thigh bones but not both…..

 ( without flesh on them…. Rinse them clean and let them dry). 
Place in a jars ensure bone is covered with the fluid. .

Note you may need Magnifying glass, and or bright light to observe bubbles….

Coke extension experiment

Extension Activity, read and watch the you tubes before you do the experiment.........
https://youtu.be/lbSzOlOobYo  
click here or scroll down to see video..

Reserve all bones in each of their own liquid til day seven

Place each bone on a paper towel……..

Wear eye protection……this may get messy…..

Use a hammer and smash each bone til it breaks……

Record the number of hits it took for the bone to break……   record your observations on how the bone broke…e.g did it shatter into small pieces……   and why you think the bones acted differently……

Watch the you tubes for the experiment and the science behind it.

https://youtu.be/lbSzOlOobYo

science behind the coke experiment
https://www.bing.com/videos/search?q=Chicken+Bones+in+Coke&&view=detail&mid=AE00E988A954F6217A97AE00E988A954F6217A97&&FORM=VRDGAR&ru=%2Fvideos%2Fs

have fun and record your experiment, your observations of how the bones broke and why.... up load photos and your results...