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Thailand – Japan Student Science Fair 2020 (TJ-SSF 2020)
“Seeding Innovations through Fostering Thailand – Japan Youth Friendship”
Let’s Look at Chemistry Using Color!
1
Nodoka Nakagawa , Mahiru Matsunaga
1
1
Advisor: Atsutoshi Yokoyama
1 National Institute of Technology, Sasebo College
Abstract
When you imagine the “clock reaction”, that must be the “iodine (I2)” clock reaction. Iodine clock
reaction is very well-known and easily prepared to enjoy people by changing solution color. Some high
school uses this reaction in chemistry class to study redox reactions. However, the simple dark iodine
solution color never satisfied us because we wanted to see other “colors” in the clock reaction. Thus,
we found a “formaldehyde” clock reaction and modified the reaction conditions to prepare colors. We
were successfully able to demonstrate the colored clock reaction, and prepared six-colored reactions
(red, orange, yellow, green, blue and purple) to remind people of rainbow. In addition, we joined a
“delivery experiment” as a presenter/organizer and show the rainbow clock reaction to elementary
school kids. Keywords: clock reaction, rainbow color, redox, science show
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