Purity of egg shell
Name: Ismaila Neill
Aim: To find the percentage purity of an eggshell
Apparatus and materials:
- Filter paper
- Spatula
- Eggshell
- Electrical balance
- Filter paper
- 100cm3 beaker
- Dilute hydrochloric acid (HCl)
- Pestle and mortar
- 100cm3 measuring cylinder
- Glass rod
Procedure:
- White inner lining of eggshell is carefully removed
- Egg shell is placed on dry filter paper and mass is recorded using Electronic balance
- Eggshell is broken up into small pieces using pestle and mortar
- 50cm3 of hydrochloric acid is added to beaker with eggshell and stirred with glass rod
- Stirring is continued until eggshells stop producing bubbles indicating that no more eggshell can be dissolved
- Mixture is filtered for a day and the residue of eggshell is left in filter paper
- Residue is left to dry ,and the mass of the filtrate along with the residue and dry filter paper is recorded
- The residue is removed and the mass of the filter paper is recorded.