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Chapter 4: Problem 2

You have a solution of table salt in water. What happens to the salt concentration (increases, decreases, or stays the same) as the solution boils? Draw pictures to explain your answer

Short Answer

Expert verified
As the saltwater solution boils, water molecules evaporate, leaving behind the salt molecules. As a result, the salt concentration in the remaining solution increases. This can be visualized in three stages: before boiling, where water and salt molecules are mixed together; during boiling, when water molecules evaporate; and after boiling, when the remaining solution has a higher salt concentration due to the decrease in water molecules.

Step by step solution

01

Understand the boiling process

When a solution is boiled, heat energy is added to it, and the liquid (in this case water) starts to evaporate, turning into vapor. As a result, the amount of liquid in the solution gradually decreases.
02

Visualize the solution before boiling

To help understand the process better, we can draw a container (e.g., a beaker) containing the saltwater solution before boiling. The beaker shows water molecules (H2O) mixed with salt molecules (NaCl). The salt concentration is represented by the ratio of salt molecules to the overall molecules in the solution. ![Container Before Boiling](https://i.imgur.com/zWNRLFo.png)
03

Visualize the boiling process

As the solution is heated and starts to boil, water molecules gain kinetic energy and turn into vapor. Water molecules then leave the solution in the form of vapor, while salt molecules remain in the container. The beaker now has fewer water molecules but the same number of salt molecules. ![Boiling Process](https://i.imgur.com/nQuFUT4.png)
04

Visualize the solution after boiling

After some time, the amount of liquid in the solution has decreased, but the salt molecules are still present in the container. The concentration of salt in the remaining solution has increased due to a decrease in the amount of water. ![Container After Boiling](https://i.imgur.com/afboKK9.png)
05

Conclusion

As the saltwater solution boils, water molecules evaporate, leaving behind the salt molecules. As a result, the salt concentration in the remaining solution increases.

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