To measure the amount of calcium carbonate CaCO3  in a seashell, an analytical chemist crushes a  2.900g  sample of the shell to a fine powder and titrates it to the endpoint with  162.mL  of  0.310M  hydrogen chloride  HCl  solution.   The balanced chemical equation for the reaction is: 2HClaq + CO2−3aq + H2CO3aq -> 2Cl−aq   Calculate the mass percent of CaCO3 in the sample.

Chemistry by OpenStax (2015-05-04)
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ISBN:9781938168390
Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Publisher:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Chapter4: Stoichiometry Of Chemical Reactions
Section: Chapter Questions
Problem 91E: A sample of solid calcium hydroxide, Ca(OH)2, is allowed to stand in water until a saturated...
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To measure the amount of calcium carbonate

CaCO3

 in a seashell, an analytical chemist crushes a 

2.900g

 sample of the shell to a fine powder and titrates it to the endpoint with 

162.mL

 of 

0.310M

 hydrogen chloride 

HCl

 solution.

 

The balanced chemical equation for the reaction is:

2HClaq + CO2−3aq + H2CO3aq -> 2Cl−aq
 
Calculate the mass percent of
CaCO3
in the sample. Be sure your answer has the correct number of significant digits.

 

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