New Investigation-Risk Assesment Complete

Alteration of previous Idea:

Chemistry EEI Take 2

Theory: Investigating the extent to which like dissolves like.

Investigate: How does the Ksp of salt in water compare to the Ksp of salt in slightly polar and non-polar solutions.

1) Ksp of salt in water

2) Ksp of salt in ethanol

3) Ksp of salt in oil

Then investigate temperature dependence of the Ksp of salt in the same solutions, at a constant temperature.

How do the results of this experiment contribute to the theory ‘like dissolves like’?

General Equipment list/method:

bubette

retort stand

clamp

ethanol

oil

distilled water

Therefore, I need to investigate the cause of separation of the Na ions from the Cl ions

Procedure:

1.         Select “Hot Plate & Mag Stir” from the Equipment menu.  Place 25.00 mL of an unknown brine solution into a 100 mL beaker.  Place the beaker on the magnetic stirrer.  Add 0.100 mL of potassium chromate. Select the magnetic stirrer and use the context menu to set the stirring rate.

 

2.         Carefully fill a 50.00 mL burette with standardized silver nitrate solution. Zero the burette to 0.00 mL and position  it over the 100 mL beaker.

 

3.         Titrate the contents of the beaker with silver nitrate from the burette.  Initially the silver nitrate may be added rapidly with continuous stirring.  At this point, large amounts of white solid should be forming.  Slow down subsequent additions of silver nitrate until a faint brick red precipitate forms indicating the end of the titration.

 

4.                  Record all pertinent data on the data sheet.  Read the burette volume to +/- 0.1 mL .

 

5.                  Repeat the titration until the final volumes agree to +/- 0.2 mL.

 

6.                  Fill in the remainder of the data sheet and perform all calculations.