Lab 20: Solubility Inquiry Lab

Lab 20: Solubility Inquiry Lab




Introduction/Purpose: 

The purpose of this lab was to create a procedure on our own to identify the mystery solid using solubility, qualitative, and qualitative data. In this lab, we were given some information on our lab manual including the three different solubility curves of NaCl, NaNO3, and KNO3. We were also given materials like beakers, graduated cylinders, a thermometer, and the mystery solid. What we did was create a plan of action where we choose how we would set up the procedure. We then carried out the procedure and found out that the mystery solid was insoluble meaning that our mystery solid was NaCl. 

Solubility curves shows us whether a solution is saturated or not.
Saturation is the point in which no more solute can be dissolved in the solvent
Unsaturated is when no more solute can be dissolved and the solvent has not reached maximum capacity
Supersaturated is the point past saturation and the solvent has reached maximum capacity

Procedure: 

For our procedure, we got one big beaker and a smaller one that would fit into the bigger one. We measured out 10 mL and put it into the smaller beaker and filled the bigger beaker with water to act as a hot bath so the temperature of the small beaker stayed constant. We then waited until the temperature of the 10 mL of water was at 50°C. After the water was at the correct temperature,  we added 5.5g of our mystery solid into the water and stirred for about 2 minutes. After 2 minutes, the solid was not completely dissolving, this meaning the only option that it could be was NaCl.

Data:

The volume of the water was 10mL and the final temperature of the water when we mixed in the solvent was 50°C. The amount of the mystery substance that we measured and mixed in for 2 minutes was 5.5 grams. 

Conclusion/Challenges:

The mystery liquid, after creating a procedure and conducting the experiment, turned out to be NaCl (Sodium Chloride).  When we heated up the water to 50°C. We found out that after stirring 5.5g of the solvent into the water for 2 minutes that it was insoluble, this meaning NaCl was the only option. Another reason why we believed that it was NaCl was because of the appearance, unlike other groups, our mystery substance was not clumpy and appeared to look more like NaCl. If the substance did dissolve, it would have either been NaNO3 or KNO3. The relationship between solubility and temperature is that as the temperature increases, solubility also does. A challenging part of this lab was coming up with the procedure of how to conduct the experiment and finding out what the mystery substance was. 














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