Solutions Mini Lab

Today in chemistry we made solutions out of sugar/water and salt/water. A solution is known as a homogeneous mixture of two or more pure substances. These next two compounds make up the solution and that would be solute and solvents: A solute is what is being dissolved, and a solvent is what is dissolving the solute. For example, to make a solution of salt water, you would take salt, which would be the solute, and water, which would be the solvent. The solvent is usually in the most abundance and the solute is in the least. For our experiment we created a solution of salt water and a solution of sugar which made the water the solute and the salt and sugar the solvents. Just by looking at our solutions there was no way to tell which one was which so in order to figure this out we had go back to the basics and work our way up. We began with the clarification that salt which is NaCl was indeed an ionic compound while the sugar sucrose which is C12H22O11, was not an ionic compound. We used a light bulb with metal prongs attached to it and stuck the prongs into the solutions, to find that saltwater conducted and made the light bulb glow but the sugar water or the deionized water didn’t conduct the electricity to light the bulb.

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We hypothesized that the salt itself must break down into individual Na+ and Cl ions which would explain why it would conduct electricity if the current was passed through it. This also showed that the sugar water and deionized water wouldn’t conduct electricity. This experiment introduced us to electrolytes and nonelectrolytes. Electrolytes are known as substances that dissociates into ions when dissolved in water and nonelectolytes are substances that dissolve but don’t dissociate into ions when it does so.

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The above picture shows that you can create a particle diagram of a sodium chloride solution and a sugar solution. The sodium chloride solution would have water surrounding it evenly and due to opposites attract the water has a partial charge so the hydrogen will be facing the Cl but will be turned away from the Na because hydrogen is positive. The sugar solution will have the hydrogen facing away from the molecules because of the partial charge and will also have water surrounding a bunch of molecules.

Sources:

Class Experiment

Lab Notebook/Results

In class Discussion 

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