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Effect of Change of Pressure on State Change of Matter

What causes f...

Question

What causes foaming when soaps are vigorously dissolved in fresh water or distilled water?

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Solution

1. Soaps tend to concentrate on the surface of the solution and therefore, lowers it's surface tension and thus causing foaming.

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Q. Sunita performs two sets of experiments to study the formation of lather(foam) by using liquid soap.
Set 1 : She takes 10 ml of distilled water in test tube 'A', adds 5-6 drops of liquid soap in it and shakes the test tube vigorously.
Set 2 : She takes 10 ml of distilled water in test tube 'B', adds 5-6 drops of liquid soap in it alongwith half spoonful of CaSO₄, and shakes the test tube vigorously.
(a) In which test tube, A or B, less lather is formed? Why?
(b) In which test tube, A or B, more lather is formed? Why?

Q. A soap solution was added to the given water samples:-
A- distilled water, B- underground water and C- distilled water and CaSO₄.
Which of the given water sample will produce maximum foam and which will give rise to scum?

Explain why:

(a) Boiled or distilled water taste flat.

(b) Ice at $0^{\circ} C .$ has the greater cooling effect than water at $0^{\circ} C .$

(c) Burns caused by steam are more severe than burns caused by boiling water.

(d) Rainwater does not leave behind concentric rings when boiled.

(e) Air dissolved in water contains a higher proportion of oxygen.

(f) If distilled water is kept in a sealed bottle for a long time, it leaves etchings on the surface of the glass.

Q. When soap or detergent dissolves in water, which of the following is true?

Q. Which of the following, when dissolved in distilled water, makes it a good conductor?

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Effect of Change of Pressure on State Change of Matter

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