Question

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?

Answer 1

Answer: This is an example of double displacement reaction.

Step-by-step explanation:

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

`AB+CD\rightarrow CB+AD`

The given chemical equation follows:

`2HCl(aq.)+CaCO_3(aq.)\rightarrow H_2CO_3(aq.)+CaCl_2(aq.)`

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.