Does your prepared soap contain excess sodium hydroxide? How can you tell? Does your household soap sample contain excess sodium hydroxide? How can you tell?

Saponification of Fatty Acids

Lab 9/Lab report #7

Purpose/Hypothesis:

Experiment/Data

Briefly Summarize the procedure

Activities 1 and 2

Data Table

	Prepared soap sample	Household soap sample
pH of sample	6 (mostly yellow-orange)	8 (green/somewhat turquoise)
Initial observation of foam layer	1/3  roughly is made of white foam present	Mostly white foam present
Oil test observation	Slight amount of white foam present	Lots of white foam about half of test tube
Hard water test observation	Small amount of frothy white foam present	Less white foam but still about 1/3 of test tube foam present

Observations:

Photos

Photo 1

Activity 2, step 8.

Photo 2

Activity 2, step 10.

Photo 3

Insert the photo of the foam layer produced by Activity 2, step 16.

Calculations:

Conclusion:

 

Post Lab Questions:

1. Does your prepared soap contain excess sodium hydroxide? How can you tell?

2. Does your household soap sample contain excess sodium hydroxide? How can you tell?