Eggshells contain calcium carbonate. The following procedure was used to determine the percentage, by mass, of calcium c

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answerhappygod
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Eggshells contain calcium carbonate. The following procedure was used to determine the percentage, by mass, of calcium c

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Eggshells contain calcium carbonate. The following procedure was
used to determine the percentage, by mass, of calcium
carbonate in 1.42 g of eggshell.
Step 1 - The eggshell was crushed and added to 100.0 mL of
0.300 mol L-1 HCl solution. Excess HCl
remained after the reaction was complete.
CaCO3(s) +
2HCl(aq) → CaCl2(aq) +
H2O(l) + CO2(g)
Step 2 - 20.0 mL samples of the excess HCl(aq)
were titrated with 0.100 mol
L-1 Na2CO3solution. The
average titre volume of Na2CO3(aq)
required to neutralise the HCl(aq) was 8.16 mL.
Calculate the percentage mass of
calcium carbonate in eggshell.
MW of CaCO3 = 100.0869 g/mol
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