Lab: 20 Solubility Inquiry Lab

I. Introduction: The purpose of the lab was to identify an unknown solid using the experimental data and known solubility data. What we did to achieve the identity of the solid was create a procedure. In this lab, we used the graph of the solubility curves of three known solids (NaCl, NaNO3, and KNO3) in order to identify an unknown solid. We first chose a temperature to test the solid, which was about 50 degrees celsius. We chose this because the three solubility curves were very far apart at 50 degrees celsius, so we could easily tell the difference between the three solids. Next, we looked at the solubility curves at 50 degrees and used 5 grams of the solid because the solids were most dispersed at that point.

II. Definitions: 
 - Solute is the substance that is dissolved.
- The solvent is the substance that dissolves the solute.
- Solubility is the measurement of how much solute will dissolve in water. 

III. Procedure: First, we measured out 10 mL of water and poured that into a big beaker. Then, we  heated it on a hot plate, until it reached 50 degrees Celsius. We then poured 10 mL of the water in the large beaker to the small beaker, once the temperature reached 50 degrees celsius. We then poured 5 grams of our solid into the beaker and waited for it to dissolve. We chose this temperature and mass because the three solubility curves were very far apart at 50 degrees celsius and 5.0 grams so we could easily tell the difference between the three solids. After stirring for about 2 minutes, we decided that the solid was not dissolving and that our unknown solid was NaCl because that was the solid that was on the  solubility curve that 5 grams was on.

IV. Data: 


V. Conclusion:  Our unknown solid was NaCl, or sodium chloride. This is because when we dissolved 5 grams of the solid into 10 mL of water at 50 degrees celsius, the NaCl did not dissolve. Also, NaCl becomes saturated when 5 g are dissolved into 10 mL of water at 50 degrees. Therefore we can conclude that NaCl is the unknown solid.


(Setup)



Comments

Post a Comment

Popular posts from this blog

Lab 18: Alka Seltzer and the Ideal Gas Law

Image
I. Introduction:   In this lab the purpose was to measure the reaction between Alka Seltzer and water and to  determine the mass of the gas produced. What we did was, first we smashed up an alka seltzer tablet and put it inside a balloon. We then put the balloon over a graduated cylinder full of water and as the two substances combined, CO2 was produced and collected in the balloon. After all the gas had been created we measured the circumference of the balloon. We then emptied the gas and refilled the balloon with water until it had the same circumference. From this we were able to measure the water and find the volume. Through a series of calculations , we were able to conclude that the mass of CO2 was around 1.26 grams in our experiment. II. Data:  III. Calculations:  (Setup) IV: Analysis Questions:  1. Discuss an area in this lab where experimental error may have occurred. There are many instances where an experimental error may have occurred  For exam
Read more

Lab 11: Flame Test Lab

Image
I. Introduction:  The purpose of this lab was to observe how certain atoms react and release energy within different compounds and solutions. We performed the lab by taking samples of the nine compounds and held them over a bunsen burner. Then, we observed any color or texture changes and recorded them. We also had identify two unknown chlorine compounds using flame tests. To identify the two unknowns, we compared their flame colors to those of the other eight compounds and assumed the solution based of this. II. Pre Lab Questions: III. Data:  IV. Analysis Questions:  Picture of LiCl emitting Pink Light:
Read more

Lab 12: Electron Configuration Battleship

Image
I. Picture of My Setup:  II. Biggest Challenge: My biggest challenge playing was trying to do the electron configurations in my head. Also trying to solve the f block configuration in my head was extremely challenging. III. What I Learned: I learned how to solve electron configuration faster and efficiently using the periodic table. 
Read more