Replace all red information with your own work. Do not include this box.

Name:	Name:	Formal lab due date:

Bubbles, Bubbles Everywhere

Problem: Which soap is the best cleaner?

Background information: This experiment is designed to assist you in becoming an expert in the use of the scientific method, properly record data, and communicate in the form of a formal lab report. Your task is to evaluate various dishwashing soaps to see which are the most effective. You will be measuring the size of the bubble domes created by the various soap brands. You will assume that the bubble dome size is directly related to the cleaning power of the soap(bigger bubble domes=better cleaner).

Hypothesis: If_________________________________________ then_____________________

_____________________________________________________________________________

Procedure:

Materials: different brands of dish soap	metric ruler	straw

Graduated cylinders (10mL and 100mL)

Steps:

Using a 10 mL graduated cylinder, measure 3 mL of dishwashing liquid. Transfer to a 250 mL beaker.

Measure 100 mL of water with a graduated cylinder. Pour into the beaker with the soap.

Stir solution thoroughly.

Using a graduated cylinder, measure out 10 mL of soap solution and pour onto your lab table. Spread evenly with the palm of your hand to create a large, filmy area.

Dip a straw into the soap solution in your beaker. Touch the surface of your film with the straw at about a 45 degree angle.

Gently blow a bubble dome; continue to blow until it pops.

With a ruler, measure the diameter of the ring of soapsuds left by the popped bubble dome in cm.

Record the data in the appropriate data table.

Repeat for 2 more trials.

Clean lab table surface.

Repeat for all of the other soap brands.

Data:

Data Table Title__________________________________

Soap Brand	Trial 1 (cm)	Trial 2 (cm)	Trial 3 (cm)	Average dome size (cm)

Conclusion/Analysis: Answer in paragraph form.

Which soap appeared to be the best cleaner?

How did your experiment relate to your hypothesis?