Epsom salts (magnesium sulfate)
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!
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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