January 16, 2013 Mariana Mendoza
The main purpose of doing this lab is to learn how to interpret solubility graphs and how the temperature does affects the solubility of different substances. There are other objectives of the lab which are learning what are concentrated, diluted, supersaturated, and saturated substances and how can they be identified. The hypothesis of this lab would be that when temperature increases, the amount of salt and copper sulfate that can be added in the water and be dissolved will increase.
The hypothesis will be proven because when temperature is increased, energy is released and this energy breaks the forces that held up the atoms together of a substance. This being said, then when the temperature in a mixture increases, then the solute will be able to dissolve completely and each time temperature is increased, there should be more amount of solute that can be added. When the solute is saturated, then a precipitate will form and crystals should start appearing.
1) Place 15.00 grams of salt in a beaker (Measure it out exactly) 2) To the beaker with the salt, add 100mL of distilled water and add a thermometer. 3) Dissolve the water in a hot water bath. Remove the beaker from the bath as the first crystals begin to appear and record the temperature. The solution is saturated at this point. 4) Add an extra 10g of salt and repeat step 3 to the above solution. Day 2:
1) Put 25mL of water at room temperature in a beaker.
2) To this beaker with the water add 60g of sugar.
3) Repeat steps 3 and 4 from Day 1, add 10g of sugar in each trial. 4) For each trial just add sugar do not add water.
15 g salt no crystals
25 g salt no crystals
35 g salt non-dissolved amount of salt in beaker
1 g copper sulfate...