Skip to main content
Ch.14 - Solutions
Tro - Chemistry: A Molecular Approach 6th Edition
Tro6th EditionChemistry: A Molecular ApproachISBN: 9780137832217Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoTro 6th EditionCh.14 - SolutionsProblema 48
Capitolo 14, Problema 48

A KCl solution containing 38 g of KCl per 100.0 g of water is cooled from 60 °C to 0 °C. What happens during cooling? (Use Figure 14.11.)

Guida verificata passo dopo passo
1
Identify the solubility of KCl at 60 °C using Figure 14.11. This will tell you how much KCl can dissolve in 100 g of water at this temperature.
Determine the solubility of KCl at 0 °C using the same figure. This will indicate how much KCl can remain dissolved in 100 g of water at the lower temperature.
Compare the initial concentration of KCl (38 g per 100 g of water) with the solubility at 0 °C. This will help you understand if the solution is supersaturated, saturated, or unsaturated at 0 °C.
If the initial concentration is higher than the solubility at 0 °C, calculate the amount of KCl that will precipitate out of the solution as it cools.
Describe the physical changes that occur during the cooling process, such as the formation of KCl crystals if the solution becomes supersaturated.

Risposta video verificata per un problema simile:

Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.

Concetti chiave

Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.

Solubility

Solubility refers to the maximum amount of a solute that can dissolve in a solvent at a given temperature and pressure. In the case of KCl in water, solubility decreases as temperature decreases, meaning that less KCl can remain dissolved in the solution when cooled from 60 °C to 0 °C.
Video consigliato:
Percorso guidato
00:28
Solubility Rules

Crystallization

Crystallization is the process where dissolved solute particles come together to form solid crystals as the solution becomes supersaturated. As the KCl solution cools, it may reach a point where the concentration of KCl exceeds its solubility limit, leading to the formation of KCl crystals.
Video consigliato:
Percorso guidato
03:04
The crystal field splitting pattern for octahedral complexes has the d orbitals on or along the axes as having the higher energy.

Phase Changes

Phase changes involve transitions between solid, liquid, and gas states of matter. In this scenario, as the KCl solution cools, the temperature drop can lead to a phase change where dissolved KCl transitions from the aqueous phase to the solid phase, resulting in the precipitation of KCl crystals.
Video consigliato:
Percorso guidato
01:46
Entropy in Phase Changes
Pratica correlata
Domanda del libro di testo

A KNO3 solution containing 35 g of KNO3 per 100.0 g of water is cooled from 40 °C to 0 °C. What happens during cooling? (Use Figure 14.11.)

Domanda del libro di testo

Scuba divers breathing air at increased pressure can suffer from oxygen toxicity—too much oxygen in their bloodstream— when the partial pressure of oxygen exceeds about 1.4 atm. What happens to the amount of oxygen in a diver's bloodstream when he or she breathes oxygen at elevated pressures? How can this be reversed?

1102
views
Domanda del libro di testo

A solution contains 35 g of NaCl per 100.0 g of water at 25°C. Is the solution unsaturated, saturated, or supersaturated? (Use Figure 14.11.)