Home > Resources > Secondary School Corner > Resource Book for Sixth-Form Practical Chemistry (Photos - Experiment 3)

Resource Book for Sixth-Form Practical Chemistry

Experiment 3

Calcium Carbonate in Eggshell

image: Boiling the eggs Boiling the eggs
image: Removing the eggshell Removing the eggshell
(The protein membrane was left behind)
image: Eggshell Eggshell
image: The eggshell was ground into fine powder The eggshell was ground into fine powder
image: The eggshell powder was dissolved in a liquid mixture of aq. HCl and ethanol The eggshell powder was dissolved in a liquid mixture of aq. HCl and ethanol
image: Excess HCl is being back-titrated with NaOH solution Titration – Before the end-point

Excess HCl is being back-titrated with NaOH solution

Indicator: Phenolphthalein
image: Colour change at the end-point Titration – Colour change at the end-point

Excess HCl is being back-titrated with NaOH solution

Indicator: Phenolphthalein

2004 Department of Chemistry, The Chinese University of Hong Kong