著者

柿原 聖治

出版者

一般社団法人 日本科学教育学会

雑誌

日本科学教育学会年会論文集 28 (ISSN:21863628)

巻号頁・発行日

pp.521-522, 2004-07-30 (Released:2018-05-16)

参考文献数

1

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物が水に溶けると,その重さは一部なくなると考える小学生の考え方は,大学生になると修正されるが,体積増加までないと考えている。また,水以外の溶媒を挙げることができない学生が非常に多いので,ヨウ素を有機溶媒に溶かす実験を行わせて,理解を助けた。

著者

柿原 聖治

雑誌

東邦学誌 = Journal of Aichi Toho University (ISSN:02874067)

巻号頁・発行日

vol.45, no.1, pp.73-78, 2016-06-10

著者

柿原 聖治

出版者

一般社団法人 日本科学教育学会

雑誌

科学教育研究 (ISSN:03864553)

巻号頁・発行日

vol.23, no.2, pp.106-111, 1999-06-10 (Released:2017-06-30)

参考文献数

2

被引用文献数

2

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Burets, volumetric pipets, and volumetric flasks are essential for titration. Burets stands and pipet stands are also needed. It is guite much troublesome to prepare for this experiment. It takes much time and labor for students to get used to these kinds of glassware. However, it is possible to carry out a titration without any volumetric measurement at all, involving only mass measurement. Since titration is based on volumetric measurement, the author has planed a titration based on the mass measurement with an electronic balance. A new unit called weight molarity is introduced. Weight molarity is the concentration of a solution expressed in moles of solute per kilogram of solution. This unit makes a neat equation for a titration, and the method above streamlines the titration procedure very much; each student can therefore perform the experiment with ease and speed. It is high time for us to reconsider the conventional volumetric titration and replace it with a gravimetric one, now that electronic balances have become quite popular.