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'JCE' Classroom Activity Connections: NaCl or CaCl[subscript 2], Smart Polymer Gel Tells More

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Title: 'JCE' Classroom Activity Connections: NaCl or CaCl[subscript 2], Smart Polymer Gel Tells More
Language: English
Authors: Chen, Yueh-Huey, Lin, Jia-Ying, Wang, Yu-Chen, Yaung, Jing-Fun
Source: Journal of Chemical Education. Dec 2010 87(12):1329-1331.
Availability: Division of Chemical Education, Inc and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail: eic@jce.acs.org; Web site: http://pubs.acs.org/jchemeduc
Peer Reviewed: Y
Page Count: 3
Publication Date: 2010
Document Type: Journal Articles
Reports - Descriptive
Education Level: Higher Education
Descriptors: Plastics, Chemistry, Scientific Concepts, Class Activities, Science Education, Laboratory Experiments, Undergraduate Students, Foreign Countries
Geographic Terms: Taiwan
DOI: 10.1021/ed100205h
ISSN: 0021-9584
Abstract: This classroom activity connection demonstrates the differences between the effects of NaCl (a salt of monovalent metal ions) and CaCl[subscript 2] (a salt of polyvalent metal ions) on swollen superabsorbent polymer gels. Being ionic compounds, NaCl and CaCl[subscript 2] both collapse the swollen polymer gels. The gel contracted by NaCl reswells in deionized water, but that contracted by CaCl[subscript 2] does not reswell. The CaCl[subscript 2] contracted gel is subsequently immersed in concentrated NaCl solution to reverse the ion exchange. The Ca[superscript 2+] ions in the contracted gel are released, and Na[superscript +] ions are redistributed in the polymer network. The ion-exchange cycle is accomplished and the water-absorbing ability of the gel is recovered. Other compound pairs of monovalent versus polyvalent metal ions involving LiCl, NaCl, KCl, CaCl[subscript 2], BaCl[subscript 2], and ZnCl[subscript 2] give similar results. (Contains 1 figure, 1 scheme and 7 notes.)
Abstractor: As Provided
Number of References: 19
Entry Date: 2011
Accession Number: EJ921265
Database: ERIC
FullText Text:
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  Data: 'JCE' Classroom Activity Connections: NaCl or CaCl[subscript 2], Smart Polymer Gel Tells More
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  Data: <searchLink fieldCode="AR" term="%22Chen%2C+Yueh-Huey%22">Chen, Yueh-Huey</searchLink><br /><searchLink fieldCode="AR" term="%22Lin%2C+Jia-Ying%22">Lin, Jia-Ying</searchLink><br /><searchLink fieldCode="AR" term="%22Wang%2C+Yu-Chen%22">Wang, Yu-Chen</searchLink><br /><searchLink fieldCode="AR" term="%22Yaung%2C+Jing-Fun%22">Yaung, Jing-Fun</searchLink>
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  Data: <searchLink fieldCode="SO" term="%22Journal+of+Chemical+Education%22"><i>Journal of Chemical Education</i></searchLink>. Dec 2010 87(12):1329-1331.
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  Data: Division of Chemical Education, Inc and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail: eic@jce.acs.org; Web site: http://pubs.acs.org/jchemeduc
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  Data: Y
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  Data: 3
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  Data: Journal Articles<br />Reports - Descriptive
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  Data: <searchLink fieldCode="DE" term="%22Plastics%22">Plastics</searchLink><br /><searchLink fieldCode="DE" term="%22Chemistry%22">Chemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Scientific+Concepts%22">Scientific Concepts</searchLink><br /><searchLink fieldCode="DE" term="%22Class+Activities%22">Class Activities</searchLink><br /><searchLink fieldCode="DE" term="%22Science+Education%22">Science Education</searchLink><br /><searchLink fieldCode="DE" term="%22Laboratory+Experiments%22">Laboratory Experiments</searchLink><br /><searchLink fieldCode="DE" term="%22Undergraduate+Students%22">Undergraduate Students</searchLink><br /><searchLink fieldCode="DE" term="%22Foreign+Countries%22">Foreign Countries</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Taiwan%22">Taiwan</searchLink>
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  Data: 10.1021/ed100205h
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  Data: 0021-9584
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  Data: This classroom activity connection demonstrates the differences between the effects of NaCl (a salt of monovalent metal ions) and CaCl[subscript 2] (a salt of polyvalent metal ions) on swollen superabsorbent polymer gels. Being ionic compounds, NaCl and CaCl[subscript 2] both collapse the swollen polymer gels. The gel contracted by NaCl reswells in deionized water, but that contracted by CaCl[subscript 2] does not reswell. The CaCl[subscript 2] contracted gel is subsequently immersed in concentrated NaCl solution to reverse the ion exchange. The Ca[superscript 2+] ions in the contracted gel are released, and Na[superscript +] ions are redistributed in the polymer network. The ion-exchange cycle is accomplished and the water-absorbing ability of the gel is recovered. Other compound pairs of monovalent versus polyvalent metal ions involving LiCl, NaCl, KCl, CaCl[subscript 2], BaCl[subscript 2], and ZnCl[subscript 2] give similar results. (Contains 1 figure, 1 scheme and 7 notes.)
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  Data: 2011
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        Value: 10.1021/ed100205h
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      – Text: English
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        PageCount: 3
        StartPage: 1329
    Subjects:
      – SubjectFull: Plastics
        Type: general
      – SubjectFull: Chemistry
        Type: general
      – SubjectFull: Scientific Concepts
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      – SubjectFull: Class Activities
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      – SubjectFull: Taiwan
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      – TitleFull: 'JCE' Classroom Activity Connections: NaCl or CaCl[subscript 2], Smart Polymer Gel Tells More
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            NameFull: Chen, Yueh-Huey
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            NameFull: Lin, Jia-Ying
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            NameFull: Wang, Yu-Chen
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            NameFull: Yaung, Jing-Fun
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