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CHEM403 Lecture Notes - Lecture 9: Ajna, Starch, Limiting ReagentExam


Department
Chemistry
Course Code
CHEM403
Professor
Winans
Study Guide
Final

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Lab 9: Chemical Timer
Group Portion
Ajna Halac, Kella Psillas
1. Starch is an indicator for iodine, it causes a color change. It was used in this experiment ro
better show the color changes that took place.
2.
Table 1: Reaction Table
Original
color
𝐼2
2𝑆2𝑂3
2βˆ’
𝑆𝑂4
2βˆ’
𝑆2𝑂8
2βˆ’
πΌβˆ’
πΆπ‘™βˆ’
Dark
blue
𝐼2
----------
----------
----------
----------
----------
----------
Clear
2𝑆2𝑂3
2βˆ’
Clear
----------
----------
----------
----------
----------
Clear
𝑆𝑂4
2βˆ’
Dark
blue
Clear
----------
----------
----------
----------
Clear
𝑆2𝑂8
2βˆ’
Dark
blue
Clear
Clear
----------
----------
----------
Light
purple
πΌβˆ’
Dark
blue
Clear
Light
purple
Dark
blue
----------
----------
Clear
πΆπ‘™βˆ’
Dark
blue
Clear
Clear
Clear
Light
purple
----------
3.
- 𝐼2+ 𝑆 2𝑂8
2βˆ’β†’ 𝐼 βˆ’+𝑆𝑂 4
2βˆ’
- Changed color from clear to dark blue showing that a reaction occurred.
- 𝑆2𝑂8
2βˆ’+ 𝐼 βˆ’β†’ 𝐼 2+𝑆𝑂 4
2βˆ’
- Changed color from light purple to dark blue showing that a reaction occurred.
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