surface property and hydrogen bonding amber sager
TRANSCRIPT
MATERIALS
shallow dish or Petri dish
water
paper clip
rubber band, approximately 5 cm in diameter
micropipets or droppers (2)
vegetable oil
liquid dish detergent
PROCEDURE
Thoroughly clean and dry the dish.
Fill the dish almost full with water. Dry your hands.
Being careful not to break the surface, gently place
the paper clip on the water. Observe what happens.
Repeat Steps 1 and 2.
Gently place the open rubber band on the water.
Slowly add oil drop by drop onto the water encircled by
the rubber band until that water is covered with a layer of
oil. Observe for 15 seconds.
Allow one drop of dish detergent to fall onto the center of
the oil layer. Observe the system for 15 seconds
CONCLUSION
While doing this lab I had a few challenges. I
couldn’t get the exact ingredients and the paper clip
was hard to get to float. When I did get it to float the
oil made it sink. The soap made all the oil break up.
A source of error was having to replace the Petri
dish with a container.
The paper clip in step 3 floated. If the paper clip
becomes wet I believe it can still float because of the
surface tension. The rubber band became an oval
because the oil spread it out.