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Materials:

 

Soap powder

Detergent powder

Epsom salts (magnesium sulfate)

Measuring spoons

Small jars or test tubes (all the same size)

 OTHER IDEAS TO EXPLORE:

 

Do all detergents make the same amount of suds?

 

Test your water for hardness like this.

 

Make a soap solution in one jar. Add 1 tsp. soap to 1/2 jar of water, and let it dissolve.

 

Add a few drops of soap solution to clean tap water, and shake.

 

If it makes suds, the water is soft. If the solution curdles, the water is hard!

Experiment 2

Which produces more suds in your water, soap or detergent?

 

1.    Fill the jars half full of water.

2.    Add 1/4 tsp. soap to one jar.

3.    Add 1/4 tsp. detergent to the other jar

4.    Cover jars and shake hard

 

 

Which produces more suds?

 

Make the water "chemically hard" by adding 1/4 tsp. Epsom salts to the jars. Cover and shake again. Now which is better?

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