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Essay Details:
Essay text:
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. 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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- An Investigation into the Factors Affecting the Rate of the Reaction between Calcium Carbonate and Hydrochloric Acid
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- To Determine The Percentage By Mass Of Calcium Carbonate In Eggshells
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- Solution
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