Calcium carbonate is insoluble in water. Yet, it dissolves...

Name: Problem 94, Chapter 24: Chemistry A Molecular Approach
Uploaded: 2020-05-28T11:55:17-08:00
Duration: 2 min 28 s
Channel: Lewis Rose
Description: Calcium carbonate is insoluble in water. Yet, it dissolves in an acidic solution. Calculate the standard enthalpy, entropy, and Gibbs free energy change for the reaction between solid calcium carbonate and hydrochloric acid. What drives the reaction, the enthalpy change or the entropy change?

Calcium carbonate is insoluble in water. Yet, it dissolves in an acidic solution. Calculate the standard enthalpy, entropy, and Gibbs free energy change for the reaction between solid calcium carbonate and hydrochloric acid. What drives the reaction, the enthalpy change or the entropy change?

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Key Concepts

Standard Enthalpy Change

Standard enthalpy change represents the heat absorbed or released during a reaction at constant pressure under standard conditions. It indicates whether a reaction is exothermic (releases heat) or endothermic (absorbs heat), providing key insight into the reaction’s energy profile.

Standard Entropy Change

Standard entropy change measures the change in the disorder or randomness of a system as a reaction proceeds. It reflects the extent to which the arrangement of molecules becomes either more disordered or more ordered, which can significantly influence the overall spontaneity of the reaction.

Gibbs Free Energy Change

Gibbs free energy change is a thermodynamic quantity that combines both enthalpy and entropy changes, predicting whether a reaction will be spontaneous under constant temperature and pressure. It is defined by the equation ?G = ?H - T?S, where a negative value indicates a spontaneous process.

Thermodynamic Driving Force

The thermodynamic driving force refers to the predominant factor—either enthalpy or entropy—that pushes a reaction towards spontaneity. Analyzing this driving force helps in understanding whether the favorable free energy change arises mainly from the heat released (enthalpy) or the increase in disorder (entropy) during the reaction.

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