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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

When water is placed in a buret it forms a concave meniscus at the surface. In contrast, mercury (in a manometer for example) forms a convex meniscus (Figure 11.17). Explain why this phenomenon occurs, and why the two liquids give different results. Predict the meniscus shape if the buret is filled with ethylene glycol (HOCH2CH2OH).

images

Meniscus

Water in glass tubes (right) is attracted to the polar ‒OH groups on the surface of glass and so water forms a downward facing or concave meniscus. Mercury, however, is not attracted to the glass surface, and so forms a convex meniscus (left).

Interpretation Introduction

Interpretation: The reason for why water placed in a buret has concave meniscus whereas mercury has convex meniscus has to be determined. The meniscus shape if the buret is filled with ethylene glycol has to be predicted

Concept Introduction:

Liquid can flow through narrow spaces without the assistance of, or even in opposition to, external forces It occurs because of intermolecular forces between the liquid and surrounding solid surfaces.

Adhesive forces are attractive forces between molecules of different materials.

Cohesive forces are the intermolecular forces which cause a tendency in liquids to resist separation.

Explanation

  

When water placed in a buret, it gets attracted to the polar -OH groups present on the surface of the glass and hence a downward facing is formed. Therefore it has concave meniscus.

  

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