BR反応と僕の無限の可能性～すべてはサイエンスショーから始まった～

Ayato Hakamada

Science Inquiry CourseShizuoka Municipal High School

Motivation for applying for GSC

Love science

Science show

FSS(GSC)

科学探究科 に入学科学部 に入部

!!!!!

Oscillation

Activities at SSH ＆ FSS

課題研究, 講義, フィールドワーク, SEC(科学英語), 英語プレゼン

研究,講義,英語討論

内容深化FSS

SSH

SSH ＆ FSS

“研究”に対するイメージが変わっていった

有機化学を究めたい

静岡市立高校

静岡大学

文部科学大臣賞 (GSC)

三大学学長賞 (高校化学グラコン)

化学部門一等獎 (TISF)

Purpose

To find new oscillations

Effects of the redox active indicators

on the oscillation behavior of the BR reaction

were investigated.

Experimental method

4.4 mmol KIO3 aq.

1.2 mmol H2SO4 aq.

25 mol H2O2 aq.

3.1 mmol Malonic Acid aq.

0.7 ｍmol MnSO4 aq.

1 % starch aq. What will happen if starch is exchanged to another indicator?

Indicator for iodine test

Overall view of equipment

Test tube

Magnetic stirrer (350 rpm)

Color sensorWhite LED light

LEGOMINDSTORM

EV3

Voltage measuring

device

Electrodes Pt, Pt

Comparison of the general BR reactions

-0.1

-0.08

-0.06

-0.04

-0.02

0

0.02

0.04

0.06

0.08

0.1

40

45

50

55

60

65

70

75

80

85

90

1

601

1201

1801

2401

3001

mV

Light(%)

S

系列2 系列1Light Voltage

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-0.06

-0.04

-0.02

0

0.02

0.04

0.06

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0.1

0

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mV

Light(%

)

0.08

0.04

0.00

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Voltage(mV)

50

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0

Light(%)

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0

0.02

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0

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50

mV

Light(%)

0.08

0.04

0.00

-0.04

-0.08

Voltage(mV)

50

40

30

20

10

0

Light(%

)

Vo

lta

ge (

V)

0.10

0.05

0

ー0.05

ー0.10

50

40

30

20

10

0

min.０ 1 2 3 4 65 ０ 1 2 3 4 65

With starch Without starch

Starch might have some important functions on BR oscillation.

Lig

ht (T

%)

Quite different color/voltage oscillations were shown.

Adding BTB to the general BR reactions

-0.2

-0.16

-0.12

-0.08

-0.04

0

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0.2

0

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601

1201

1801

2401

3001

3601

4201

V

Light(%)

S

Light Voltage

0 2 4 6 min.

-0.2

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-0.12

-0.08

-0.04

0

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0.16

0.2

0

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1

601

1201

1801

2401

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3601

4201

mV

Light(%)・

pH

S

Light pH V

With starch

0 2 4 6 8

Without starch

-0.2

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0

0.04

0.08

0.12

0.16

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0

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1

601

1201

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2401

3001

3601

4201

V

Light(%)

S

Light Voltage

-0.1

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0

0.02

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0.08

0.1

0

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50

mV

Light(%

)

0.08

0.04

0.00

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-0.08

Voltage(mV)

50

40

30

20

10

0

Light(%)

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mV

Light(%)

0.08

0.04

0.00

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Voltage(mV)

50

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10

0

Light(%)

Vo

lta

ge (

V)

0.10

0.05

0

ー0.05

ー0.10

50

40

30

20

10

0

Lig

ht (T

%)

Cyclic Voltammetry data of BTB

Is the redox reaction of BTB involved in "new oscillation" ?

BTB is easily oxidized

Bromothymolblue

Almost the same visible oscillation were observed.But there were some differences between them.

Adding redox active indicators to the general BR reactions

0

5

10

15

20

25

30

35

40

45

501

601

1201

1801

2401

3001

3601

4201

4801

5401

6001

6601

7201

7801

8401

9001

9601

10201

-0.1

-0.08

-0.06

-0.04

-0.02

0

0.02

0.04

0.06

0.08

0.1

Light(%)

S

V

Voltage Light

-0.2

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0

0.04

0.08

0.12

0.16

0.2

0

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1

601

1201

1801

2401

3001

3601

4201

4801

5401

6001

6601

7201

7801

8401

9001

9601

10201

10801

V

Light(%)

S

Light Voltage

With starch

0 5 10 15

-0.1

-0.08

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-0.04

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0

0.02

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0.06

0.08

0.1

0

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50

mV

Light(%)

0.08

0.04

0.00

-0.04

-0.08

Voltage(mV)

50

40

30

20

10

0

Light(%)

0.10

0.05

0

ー0.05

ー0.10

Vo

lta

ge (

V)

0 5 10 15

-0.1

-0.08

-0.06

-0.04

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0

0.02

0.04

0.06

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0

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50

mV

Light(%

)

0.08

0.04

0.00

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-0.08

Voltage(mV)

50

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10

0

Light(%)

50

40

30

20

10

0

min.

K4[Fe(CN)6]K3[Fe(CN)6]

３⁺ ２⁺

Lig

ht (T

%)

Consideration

✓ Redox active indicators, which were added insteadof starch, caused new oscillations in the BR reaction.

✓ We suppose that any substance as well as redox activities of [Fe(CN)6]

3- and [Fe(CN)6]4- significantly

affect the oscillation of the BR reactions. .

✓ Starch has significant effect on BR reaction.

Future subjects

Investigate how indicators cause the new oscillation in the BR reaction

✓ Clarify the effects of the quantity of indicatorsadded in the solution of the BR reaction on theoscillation behaviors

✓ Study of the effects by adding another redoxactive substances

References

Acknowledgment

I would like to thank my co-workers Mikana Sugimori, Ibuki Sugiyama,

(Shizuoka Municipal High School 2nd Grade), FSS program of Shizuoka

university, Prof. Kondo of Shizuoka University and Ms. Totsuka of Shizuoka

Municipal High School.

1. http://yamamoto-akira.org/butsuriya/BRshindou/

2. Chemistry experiment demonstration for teachers 6 (Bassamz.Shakhashiri & Ikemoto,I)

3. SSH Student Research Presentation as of 2017 (Notre Dame Seishin Gakuen· Seishin Girls High School)