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Showing revision 19
Directions
1. Obtain 6 small test tubes and mark them 1 - 6.
2. Add Solution A to Test tube 1
3. Add Solution B to Test tube 2
4. Add a grain or two of salt to Test tube 1 and Test tube 2 and make observations. Stir each with a wooden stick (separate stick for each test tube). Make observations.
Observations
Answer the following Question.
Which solution dissolved the salt? (write answer here)
5. Add Solution A to Test tube 3 and Test tube 4. Add one drop of Red dye to each test tube. Stir with wooden sticks (separate stick for each test tube). Make observations.
6. Add Solution B to Test tube 5 and Test tube 6. Add one drop of Green dye to each test tube. Stir with wooden stirrer (separate stirrer for each test tube). Make observations.
You should have :
Solution A w/ Red
Solution A w/ Green
Solution B w/Red?
Solution B w/Green?
Observations
7. Take the Test tube that Red dye dissolved into and slowly pour it into the Test tube that the Green dye dissolved into (or visa versa). Wait for a few minutes then make observations.
Observations
Answer the following questions:
a. Did the two solutions dissolve in each other?
b. What observation(s) lead you to that answer?
c. Where is the solution that the salt dissolved into?
d. What does that tell you about that solution?
e. If the Solution A and Solution B is oil and water, which is which and how do you know?
8. Take a small amount of the white granular solid (not the salt) and add it to the above Test tube (one that you used in Step 7). Stir with a wooden stick (separate from other sticks). Make observations.
Observations
9. Take a new pipette and add a few drops resulting "solution" to a specimen slide and place it under the microscope. Make observations in words and a picture below.
Answer the following questions:
a. What general shape do you see in the microscope.
b. Did the two solution actually mix and create a homogenous mixture (called a solution). If not, then what did happen and is there a name for it?
c. What do you think the white granular solid was?
Obtain a handout from your teacher. Notes on the discussion on the handout.
Other information for this lab: