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Speedy Solutions Lab

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by Hollis Martinez on 11 May 2011

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Transcript of Speedy Solutions Lab

Speedy Solutions Lab Statement of the problem: How can you control the rate at which certain salts dissolve in water? Background info: Some information that I already know about this topic is that when substances have a high temperature, they have more energy. The more energy molecules have, the faster they move.The molecules in hot water move faster than cold water because of the higher energy. Because the molecules of hot water move faster, they can more easily break apart other molecules of a different substance when they come in contact. The fast moving water molecules can break apart the bonds between the salt crystals so they become dissolved into the water. Hypothesis: The rate at which certain salts dissolve can be controlled by changing the temperature. Skills focus: Controlling variables, drawing conclusions and designing experiments. Materials: Beakers (3)
Water
Rock salt
Refridgerator
Heat source
Stopwatch Procedures: 1. Fill 3 beakers with 300 mL of water. 2. Place one beaker in the fridge for 10 minutes. 3. Leave one at room temperature. 4. Heat the water in the final beaker until boiling. 5. Place 9.9 grams of rock salt into the heated water and start the stopwatch. 6. Observe until all salt is dissolved. 7. Stop the stop watch and record observations and time into data table. 8. Repeat steps 3 through 5 for the cold water. 9. Repeat steps 3 through 5 for the water at room temperature. 10. Once you have finished recording the data, begin a lab report. Conclusions: In our lab we found that our hypothesis was true. The rate at which salts dissolves in the water can be controlled by the temperature of the water. We decided that the rock salt dissolves the fastest in hot water and the slowest in the cold water. I learned that different salts dissolve differently in varied temperatures. I also learned the you can control how fast salts dissolve into water. This applies to real-life situations because when baking different foods with salt and water you can speed up the process of the dissolving by heating it up or slow it down by cooling it. Possible errors: When conducting this lab we could have run into many possible errors. Some could have been putting different amounts of salt into each beaker, putting the salt into the water which was at a different temperature than what we had stated in our lab, maybe the water had some chemical in it or a substance that changed the amount of time it took for the salt to dissolve, or the salt could have been really old, changing the rate at which it dissoves.
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