Calcium is a chemical element with the symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal.
An eggshell is made primarily from calcium carbonate, the chemical compound which also makes up the majority of sea shells, as well as chalk and limestone.
The shell isn’t completely solid – it has thousands of tiny pores, around 9,000 on average, which allow gases to pass in and out.
Periodic Table of Elements
Chemistry of eggshell and vinegar
The egg shell is composed of calcium carbonate (CaCO3).
When calcium carbonate comes in contact with vinegar which contains acetic acid (CH3CO2H) a chemical reaction occurs.
2 CH3COOH + CaCO3 = H2CO3 + Ca(CH3COO)2
The carbonic acid breaks down to form carbon dioxide and water,
H2CO3 = H2O + CO2
The shell is made up mostly of calcium carbonate.-- it contains calcium carbonate (94%), magnesium carbonate (1%), calcium phosphate (1%), and 4% organic matter-- vinegar which contains acetic acid will dissolve the shell.
We are conducting a class Eggsperiment