The night before class, I watched
the video of the milk in motion lab online. In class my partner and I came up
with a two part hypothesis. The first part of our hypothesis was that the dish
soap is a type of degreaser, so it attacks the fat of the milk. The second part
of the hypothesis was that milk is an acid so it reacts with dish soap because
it is a base.
To
test this two part hypothesis, we created two different experiments. In the
first experiment we placed 10 milliliters of creamer into a Petri dish and put
three drops of both red and green dye, and then we placed two to three drops of
dish soap. We saw that where the soap was dropped bubbles were formed in the
creamer and moved the dye. We repeated this process three times and we got the
same results.
In
the second experiment, we placed 10 milliliters of vinegar into a Petri dish
and put 3 drops of both red and green dye, and then we placed two drops of dish
soap. We repeated this process three times. Each time there was small
reaction between the vinegar and the dish soap but nothing significant.
In conclusion, the first part of the hypothesis is more
accurate than the second part because the detergent reacted with the fat in the
creamer and let the pigment in the dye spread throughout the creamer. But
before the fat and the detergent reacted, the detergent reduced the surface tension
and allowed the food coloring to move throughout the milk. Also the detergent
reacted with protein in the creamer and changed the shape of the molecules and
set them in motion.
