What is the purpose of using a boiling stonestick when heating a

How does the principle of “likes dissolves likes” explain the differing solubilities of solutes in various solvents? 

The primary purpose of this lab is to give hands-on experience with the following basic laboratory techniques: o Meltingpointdetermination o Recrystallization(includinghowtoconductbothgravityandvacuumfiltrations) o Microscaleboilingpointdetermination Obtain a liquid Unknown and record the letter of your unknown. Fill the designated test tube with approximately 3.0 cm high of liquid. Follow Siwoloboff’s method to determine the boiling point of the liquid. The height of unknown liquid should not exceed the height of the capillary tube. Fermentation Set-up for lab 3 Place 20 g of sucrose into a 250 mL round-bottomed flask. To this add 100 mL of deionized water and about 1.5 g of yeast. Stir the solution until all of the sugar has dissolved. Add about 17-18 mL of the Pasteur’s salts solution and swirl to mix. Cap the flask with a lightly greased glass vacuum adapter to which a length of rubber tubing has been attached. Place the apparatus in a large beaker. You may want to cushion the round bottom with a bit with paper toweling since the glassware may get jostled when we move it for storage. Fill a medium sized testtubeabouthalfwaywithlimewaterandstabilizethetubeinabeakerorE.Flask. Submerge the free end of the rubber tubing in the limewater. The limewater prevents atmospheric oxygen from entering the fermentation solution and provides an outlet for the CO2 formed during the reaction. 

From these three main points write 3-4 sentences for the objective

1st part was finding the boiling point of a solid through recrystallization(vacumm filtration 

2 part was finding the melting point of a liquid using siwoloboff's method and last was prep the fermentaion for lab 3 

lab two The primary purpose of this lab is to give hands-on experience with the following basic laboratory techniques: o Meltingpointdetermination o Recrystallization(includinghowtoconductbothgravityandvacuumfiltrations) o Microscaleboilingpointdetermination Obtain a liquid Unknown and record the letter of your unknown. Fill the designated test tube with approximately 3.0 cm high of liquid. Follow Siwoloboff’s method to determine the boiling point of the liquid. The height of unknown liquid should not exceed the height of the capillary tube. Fermentation Set-up for lab 3 Place 20 g of sucrose into a 250 mL round-bottomed flask. To this add 100 mL of deionized water and about 1.5 g of yeast. Stir the solution until all of the sugar has dissolved. Add about 17-18 mL of the Pasteur’s salts solution and swirl to mix. Cap the flask with a lightly greased glass vacuum adapter to which a length of rubber tubing has been attached. Place the apparatus in a large beaker. You may want to cushion the round bottom with a bit with paper toweling since the glassware may get jostled when we move it for storage. Fill a medium sized testtubeabouthalfwaywithlimewaterandstabilizethetubeinabeakerorE.Flask. Submerge the free end of the rubber tubing in the limewater. The limewater prevents atmospheric oxygen from entering the fermentation solution and provides an outlet for the CO2 formed during the reaction. Be sure to mark your set-up with your name and section number or TA’s name and place it on the cart provided. It takes approximately one week for full fermentation. Sunshine tends to speed the process so we’ll store them for you in a sunny corner of the building. 

From these three main points write 3-4 sentences for the objective

How will the product from the distillation be purified?

4. What is the purpose of doing chromatography (both thin layer chromatography and column chromatography) on the extract from the spinach leaves?

3. Since acetone is used to grind up the spinach leaves, why not just add a lot more acetone and use acetone for the extraction?