Investigating Salt Dissolving in Water Experiment
This experiment explores the factors affecting the rate of salt dissolving in water by varying the amount of salt added and observing the time taken for complete dissolution. The independent variable is the amount of salt, the dependent variable is the time taken for dissolving, and controlled variables include water amount, water freshness, stirring rate, and water temperature. Results show that as the amount of salt increases, the time taken for complete dissolution also increases.
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Controlling Variables Salt Dissolving in Water
Solution Formation How does temperature effect solubility? Does particle size affect rate of dissolving? Does dissolving occur at a constant rate? Does stirring affect rate of dissolving? Do sugar and salt dissolve at the same rate?
1. Add 1 teaspoon (5 mL) of table salt (NaCl) to the 250 mL container of water. Stir until the salt is completely dissolved. Record the length of time required for the salt to dissolve in table 1. Repeat this procedure using 2 teaspoons, 3 teaspoons, 4 teaspoons, and 5 teaspoons of salt. Important: Always start with fresh water before adding any salt. 2. 3. Amount of Salt Length of Time for Salt to Dissolve 1 teaspoon 2 teaspoons 3 teaspoons 4 teaspoons 5 teaspoons 4. What is the independent variable? 5. What is the dependent variable 6. List at least two controlled variables. 7. What did you find out about how the amount of salt affects the length of time it takes the salt to dissolve? 8. Explain why you think you got these results.
1. Add 1 teaspoon (5 mL) of table salt (NaCl) to the 250 mL container of water. Stir until the salt is completely dissolved. Record the length of time required for the salt to dissolve in table 1. Repeat this procedure using 2 teaspoons, 3 teaspoons, 4 teaspoons, and 5 teaspoons of salt. Important: Always start with fresh water before adding any salt. 2. 3. Amount of Salt Length of Time for Salt to Dissolve 1 teaspoon 20 seconds 2 teaspoons 25 seconds 3 teaspoons 29 seconds 4 teaspoons 32 seconds 5 teaspoons 36 seconds 4. What is the independent variable? The amount of salt used. 5. What is the dependent variable The length of time it takes all of the salt to dissolve. 6. List at least two controlled variables. Amount of water used; fresh water each time; Rate of stirring; temperature of water What did you find out about how the amount of salt affects the length of time it takes the salt to dissolve? The more salt added, the longer time it took to dissolve. 7. 8. Explain why you think you got these results.
