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To measure the amount of calcium carbonate (CaCO) in a seashell, an analytical chemist crushes a 2.100 g sample of the shell to a fine powder and titrates it to the endpoint with 119. mL of 0.300 M hydrogen chloride (HCI) solution. The balanced chemical equation for the reaction is 2HCI(aq) + CO, (aq) ? H2CO3(aq) + 2a (aq). What kind of reaction is this?

Respuesta :

Answer: This is an example of double displacement reaction.

Explanation:

Double displacement reaction is defined as the reaction in which exchange of ions takes place.

[tex]AB+CD\rightarrow CB+AD[/tex]

The given chemical equation follows:

[tex]2HCl(aq.)+CaCO_3(aq.)\rightarrow H_2CO_3(aq.)+CaCl_2(aq.)[/tex]

By Stoichiometry of the reaction:

2 moles of hydrochloric acid reacts with 1 mole of calcium carbonate to produce 1 mole of carbonic acid and 1 mole of calcium chloride.

Hence, this is an example of double displacement reaction.