Determining the Percentage of CaCO3 in an Egg Shell

Good Shepherd International School
International Baccalaureate Diploma Programme
Chemistry HL Lab Report

Determining the

Candidate Name:

Kamalia, Ujjwal

Candidate Number:

001350-035

of

in an Egg Shell

Candidate Name: Kamalia, Ujjwal
Candidate Number:
001350-035

Table of Contents
1. Teacher’s Instruction………………………………………………………………….......2
2. Research Question………………………………………………………………………...2
3. Variables…………………………………………………………………………………..2
4. Principle Used……………………………………………………………………………..2
5. Apparatus Required……………………………………………………………………….3
6. Reagents/ Chemicals Required……………………………………………………………3
7. Procedure………………………………………………………………………………….4
8. Precautions…………………………………………………………………………….......6
9. Data Collection……………………………………………………………………………7
10. Data Processing……………………………………………………………………………8
11. Conclusion and Evaluation………………………………………………………………12

Chemistry HL Lab Report

Determination of % of CaCO3 in eggshell

1

Candidate Name: Kamalia, Ujjwal
Candidate Number:
001350-035

Teacher’s Instruction:
Carry out an experiment to determine the %of CaCO3 in egg shell.
Research Question:
What percentage by mass of an egg shell is Calcium Carbonate

?

Variables:
1.
2.
3.
Principle used:
The principle of back titration is used to determine the percentage by mass of an egg shell. Excess of

in

is added to a known mass of powdered egg shell. The solution

formed is diluted and titration is conducted on small aliquots of this solution using standard . Rather than finding the amount of

shell, the amount of

that reacted with the

of the egg

unreacted is found out. Hence this process is termed as the back

titration technique.

Chemistry HL Lab Report

Determination of % of CaCO3 in eggshell

2

Candidate Name: Kamalia, Ujjwal
Candidate Number:
001350-035

Apparatus required:
Sl. No

Apparatus

Quantity

1

Digital Balance

1

2

20 cm3 pipette

1

3

50 cm3 burette