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Surface Chemistry — Chemistry STD 12 — Question

Tamilnadu BoardEnglish MediumSTD 12ChemistrySurface Chemistry3 Marks
Question
Explain about ultrasonic dispersion. (or) How would you prepare mercury colloid?
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Answer

1. Sound waves of frequency more than 20kHz (audible limit) could cause transformation of coarse suspension to colloidal solution
2. Claus obtained mercury sol by subjecting mercury to sufficiently high frequency ultrasonic vibrations.
3. The ultrasonic vibrations produced by generator spread the oil and transfer the vibration to the vessel with mercury in water.

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