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Purity of egg shell

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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: 1. White inner lining of eggshell is carefully removed 2. Egg shell is placed on dry filter paper and mass is recorded using Electronic balance 3. Eggshell is broken up into small pieces using pestle and mortar 4. 50cm3 of hydrochloric acid is added to beaker with eggshell and stirred with glass rod 5. ...read more.


Mass of residue= (mass of filter paper + residue)-(mass of dry filter paper) =15.6-2.06 =13.14g 2. Mass of calcium carbonate= (Initial mass of eggshell)-(mass of residue) =27.55-13.14 =14.41g 3. Percentage purity of egg shell= = =52.3% Equations Word equation Calcium carbonate(s) + hydrochloric acid (aq) �Calcium chloride (aq) + carbon dioxide (g) + water (l) Chemical equation CaCO3(s) + 2HCl (aq) � CaCl2 (aq) + CO2 (g) + H2O (l) Ionic equation Ca2+(s) + CO32-(s) + 2H+ (aq) + 2Cl- (aq) � Ca2+ (aq) + 2Cl- (aq) + CO2 (g) + H2O (l) CO32-(s) + 2H+ (aq) � CO2 (g) ...read more.


* Lack of time to repeat the experiment due to time being wasted peeling off inner lining of egg shell * Eggshell was very brittle hence a lot of it tended to blow away and break off. Improvements: * Experiment could be repeated several times in order to get a wider range of data * Buying eggshells without the inner lining before hand would have saved a lot of time * Make sure to close all windows so as wind does not blow away the eggshell. Conclusion: The percentage purity of the egg shell was 52.3% although results may vary due to the limitations, which does indeed leaves room for error. ?? ?? ?? ?? ...read more.

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