A couple of weeks ago Year 4 set up an experiment to determine the effect that acid (vinegar) has on bones. The children placed some clean chicken leg bones into a beaker of vinegar, a beaker of water and a beaker of air to compare what happens to the bones and to make a fair test. They predicted the results along with their reasoning behind their predictions. Some children thought that the bones would be weaker and snap whilst some felt that the calcium in the bones would dissolve.
Today, after a good couple of weeks soaking, they were able to find out what actually happened to the bones. Year 4 were fascinated that the bones soaked in vinegar were flexible and the properties of the bones had changed, they could no longer support, help to move or protect the skeleton. We concluded that the calcium in the bones dissolves in vinegar and once the calcium has gone there is only soft bone tissue.
We also looked at the chicken bones in the water which had remained strong but was producing a very strong smell, Charlie correctly suggested that the bones were rotting. It is the bone marrow inside the bone that is broken down by water and speeds up the rotting process, they really did smell!
I think Mrs Wason and children who work in her classroom will be pleased to have the beakers of vinegar and smelly water removed after the end of our experiment today!
Great work Year 4!