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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 (HOCH 2 CH 2 OH). 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 ).

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Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

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Chapter
Section
BuyFindarrow_forward

Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 11, Problem 28PS
Textbook Problem
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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).

Chapter 11, Problem 28PS, When water is placed in a buret it forms a concave meniscus at the surface. In contrast, mercury (in

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 of Solution

  

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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Chemistry & Chemical Reactivity
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