chemist crushes a 4.500g sample of the shell to a fine powder and titrates it to the endpoint with 172.mL of 0.380M hydrogen chloride HCl solution. The balanced chemical equation for the reaction is: →+2HClaq  CO2−3aq + H2CO3aq  2Cl−aq   What kind of reaction is this? Percipitation, acid-base, or redox   Calculate the mass percent of CaCO3 in the sample. Be sure your answer has the correct number of significant digits

Chemistry
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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To measure the amount of calcium carbonate CaCO3 in a seashell, an analytical chemist crushes a 4.500g sample of the shell to a fine powder and titrates it to the endpoint with 172.mL of 0.380M hydrogen chloride HCl solution.

The balanced chemical equation for the reaction is:

→+2HClaq  CO2−3aq + H2CO3aq  2Cl−aq
 
What kind of reaction is this? Percipitation, acid-base, or redox
 
Calculate the mass percent of CaCO3 in the sample. Be sure your answer has the correct number of significant digits.

 

Expert Solution
Step 1

The amount of sample crushed= 4.500g

Volume of HCl = 172.mL

Molarity of HCl =0.380M 

The balanced chemical equation for the reaction between HCl and CO3-2 is 

2HCl (aq) + CO3-2(aq) -------> H2CO3(aq) + 2Cl-(aq) 

 

 

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