Prelab Brief
To compare the foaming capacity of soap in soft water and hard water, and understand the effect of dissolved calcium/magnesium salts.
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Theory
Compare the cleaning capacity of soap in hard water vs soft water. To compare the foaming capacity of soap in soft water and hard water, and understand the effect of dissolved calcium/magnesium salts.
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Formula
Principle: To compare the foaming capacity of soap in soft water and hard water, and understand the effect of dissolved calcium/magnesium salts.
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Aim
To compare the foaming capacity of soap in soft water and hard water, and understand the effect of dissolved calcium/magnesium salts.
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Apparatus
- Two test tubes
- Soft water (distilled)
- Hard water (containing CaCl₂)
- Soap solution
- Stopper for test tubes
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Procedure
- Take equal volumes of soft water and hard water in two test tubes.
- Add equal amounts of soap solution to each.
- Stopper and shake both test tubes equally (20 times).
- Compare the quantity and persistence of foam.
- Observe the scum/precipitate formed in hard water.
Pre-Lab Questions
What is the main aim of the Soap in Hard vs Soft Water Experiment?
Which principle is demonstrated in the Soap in Hard vs Soft Water Experiment?
What apparatus is required for this experiment?
Why is Two test tubes used in this experiment?
What formula or relationship is verified in this experiment?
What precaution should be followed while performing this experiment?
What conclusion can be drawn from the Soap in Hard vs Soft Water Experiment?