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Essay

To Determine The Percentage By Mass Of Calcium Carbonate In Eggshells

Essay specific features

 

Issue:

Science

 

Written by:

Barbara A

 

Date added:

June 9, 2016

 

Level:

University

 

Grade:

B

 

No of pages / words:

4 / 1028

 

Was viewed:

5873 times

 

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Essay content:

In order to monitor the quality of eggshells, the following experiment has to be done to determine the percentage of calcium carbonate in eggshells. In this experiment, back titration is used. First, excess acid is reacted with the calcium carbonate in eggshells: 2HCl(aq) + CaCO3(s) > CaCl2(aq) + H2O(l)+ CO2(g) Later, if we can find out the number of mole of unreacted acid, number of mole of calcium carbonate can then be found out...
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The number of mole of unreacted acid can be found by titration with the following reaction: HCl(aq) + NaOH(aq) > H2O(l) + NaCl(aq) Percentage by mass of calcium carbonate in eggshell can then be calculated by the following formula: % by mass of CaCO3 = Requirements eggshell burette, 50 cm3, and stand pipette, 25 cm3 pipette filler methyl orange indicator 1 M NaOH solution, standardized 1 M hydrochloric acid, standardized ethanol wash-bottle with de-ionized water mortar and pestle forceps safety spectacles 2 beakers, 100 cm3 volumetric flask, 250 cm3 filter funnel, small magnetic stirrer pH meter electronic balance Procedures 1...
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