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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 54, Number 4
JKCSEZ 54(4)
August 20, 2010 

 
Title
Analysis of High School Science Textual Descriptions of Scientifically Debatable Compounds According to the Experimental Results by MBL: A Case Study of Carbonic Acid in Water and Aqueous Solution of Carbon Dioxide

MBL 실험 결과를 토대로 한 과학적으로 논의 되고 있는 화합물의 고등학교 과학 교과서 기술 분석: 이산화탄소 수용액과 탄산 수용액의 경우
Author
Jee Young Jeoung, Kyeong Jin Min, Hee K Chae*

정지영, 민경진, 채희권*
Keywords
탄산, 이산화탄소 수용액, 과학 교과서 , Carbonic acid, Aqueous solution of carbon dioxide, Science textbook
Abstract

The purposes of this study are to investigate the description of scientifically debatable carbonic acid in the Korean high school textbooks, characterize the physical properties of ‘carbonic acid solutions’ by using an MBL set-up and compare the properties with textual ones. Four different aqueous solutions of carbon dioxide have been prepared and analyzed: naturally aerated aqueous solution, dry ice-dissolving solution, CO2-bubbling solution and commercial carbonic acid water. Experimental findings showed that pH and conductivity of these 4 solutions ranged from 3.85 to 5.66 and from 0.21 μS/cm to 272.1 μS/cm, respectively. Out of these solutions, the dissociation constant(Ka1) of the bubbling solution at room temperature could be calculated to 5.7 × 10-7 which value is comparable to the textual 4.3 × 10-7 within experimental errors, which means that textual compound is not pure carbonic acid but the equilibrated mixture of carbonic acid and the aqueous solution of carbon dioxide. On the other hand, textual analysis showed that most of high school textbooks used carbonic acid as an example of weak acid and buffer solution of the blood but none of them distinguished the carbonic acid from the aqueous solution of carbon dioxide. Only one textbook, however, tiered two species in the chemical equation.

Page
479 - 486
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