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2002
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In the Classroom
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JCE Classroom Activity
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Acid–Base Reactions with Carbon Dioxide
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Ana Paula Carvalho, Ångela F. S. S. Mendonça, and M. Fátima
M. Piedade
Departamento de Química e Bioquímica da Faculdade de Ciências,
da Universidade de Lisboa, Campo Grande, Bloco C8, 1749-016 Lisboa, Portugal
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December 2002
Vol. 79 No. 12
p. 1464A
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| Abstract |
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One way to make chemistry appealing to young students is to allow them to actively participate in chemical demonstrations that are safe and fun. This Activity reproduces two well-known demonstrations where the chemical reagents have been replaced by common household products. The Activity focuses on two acid-base reactions. In the first reaction, an aqueous solution of powdered laundry detergent is neutralized with the acid formed by the dissolution of exhaled carbon dioxide. This uses the spice turmeric, also known as Indian saffron or curcuma, as an indicator. In the second reaction, vinegar and baking soda produce carbon dioxide gas. Powdered laundry detergent is added to the reaction mixture to obtain a longer-lasting, thick foam. When detergent is not used, the bubbles of carbon dioxide gas rise to the same level in the cup, but dissipate quickly. Questions for the students connect the two reactions in terms of how carbon dioxide plays a role in both reactions.
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| More Information |
 Citation |
Carvalho, Ana Paula; Mendonça, Ångela F. S. S.; Piedade, M. Fátima M. J. Chem. Educ. 2002 79 1464A.
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Keywords |
Acid–Base Chemistry; Demonstrations; Introductory / High School Chemistry; Natural Products; Teaching / Learning Aids
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History |
Created:
Last Updated: |
October 29, 2002
March 15, 2005
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