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Science Lab Experiment: Hard to Soft Water


Demonstration: Hard to Soft Water

Object: To determine some characteristics of hard and soft water.

Materials: 3 test tubes, hard water (tap), soft water (distilled) and washing soda (sodium carbonate), soap solution, dropper, test tube rack

Diagram:
hard to soft water lab set up


Materials: About 50 ml tap water was added to the first two test tubes. To the third tube was added the same amount of distilled water. To the second tube was added a pinch of washing soda. A dropper was then used to add some solution to the tubes. The drops required to make a lather were counted and recorded.

Observations: It was seen that the hard water in test tube #2 formed a lather after only 3 drops of soap solution were added. The distilled water in test tube #3 took only 1 drop to form suds.

Conclusions: It was concluded that soft water is pure and produces suds more easily. Hard water is not pure. It contains many different minerals. However, hard water can be softened by adding washing soda (sodium carbonate).

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