Effect of Temperature on Solubility Lab

Topics: Solubility, Water, Mass Pages: 5 (1365 words) Published: August 12, 2010
Effect of Temperature on Solubility Lab

Purpose: What is the solubility of minerals in water? What is the relationship between temperature and solubility?

Hypothesis: If salt and sugar are each tested in water of varying temperatures, then salt and sugar's solubility will increase as the temperature also increases.

Materials:
Two 250 mL beakers
Tap water
100 mL graduated cylinder
Hot plate
Two petri dishes
Glass stirring rod
Salt
Sugar
Thermometer
Ice
Balance
Scoopula
Graph Paper

Procedure:

Part 1(Tap Water)
Measure 100 mL of tap water in a graduated cylinder and add the water to a 250 mL beaker. Use the balance to measure the mass of a Petri dish and record the mass in grams. Add salt to the petri dish until the mass is about 75 g. Record the mass to the nearest tenth of a gram. Use the scoopula to add a small amount of salt from the petri dish(about 5 grams) to the 250 mL of water. Stir the salt in the water with a glass stirring rod until completely dissolved, about two minutes. After the previous salt has been dissolved(no settling at the bottom of the beaker), add more about 5 more grams of salt and repeat step number four. Continue steps 4,5,6 until saturated, no more will dissolve. Place the thermometer in the saturated solution and record the final temperature. Weigh the remaining salt in the petri dish with the balance and record. Repeat steps 1-9 with sugar instead of salt.

Part 2(Cold Water)
Add 100 mL of water and about six pieces of ice to a 250 mL beaker. Use the balance to measure the mass of a Petri dish and record the mass in grams. Add salt to the petri dish until the mass is about 75 g. Record the mass to the nearest tenth of a gram. Use the scoopula to add a small amount of salt from the petri dish(about 5 grams) to the 250 mL of water and ice. Stir the salt in the ice water with a glass stirring rod until completely dissolved, about two minutes. After the previous salt has been dissolved(no settling at the bottom of the beaker), add about 5 more grams of salt and repeat step number four. Continue steps 4,5,6 until saturated, no more will dissolve. Place the thermometer in the saturated solution and record the final temperature. Weigh the remaining salt in the petri dish with the balance and record. Repeat steps 1-9 with sugar instead of salt.

Part 3(Hot water)
Measure 100 mL of tap water in a graduated cylinder and add the water to a 250 mL beaker. Place the beaker of water on a hot plate and heat the hot it until the temperature reads 90°C. Turn the hot plate off. DO NOT REMOVE THE BEAKER!!!!!! Use the balance to measure the mass of a Petri dish and record the mass in grams. Add salt to the petri dish until the mass is about 75 g. Record the mass to the nearest tenth of a gram. Use the scoopula to add a small amount of salt from the petri dish(about 5 grams) to the 250 mL of hot water. Stir the salt in the water with a glass stirring rod until completely dissolved, about two minutes. After the previous salt has been dissolved(no settling at the bottom of the beaker), add more about 5 more grams of salt and repeat step number four. Continue steps 4,5,6 until saturated, no more will dissolve. Place the thermometer in the saturated solution and record the final temperature. Weigh the remaining salt in the petri dish with the balance and record. Repeat steps 1-9 with sugar instead of salt if there is enough time for the lab.

Data:

SALT:
| Mass of Petri Dish (g) | Initial Mass of Petri Dish and salt (g) | Final Mass of Petri Dish and salt (g) | Solubility of salt (g/100mL water) | Final Temperature (°C) | Tap Water | 7 g | 83 g | 60 g | 16 g/100mL | 16°C | Cold Water | 7 g | 82 g | 72.5 g | 25 g/100mL | 5°C | Hot Water | 7g | 82...
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