On March 6th at 3 am, an assistant baker at Mike’s Awesome bakery in Francestown, NH was found dead lying in a pool of blood. The assistant baker was found covered in a mysterious white powder in which the earth science class must identify.
Investigators collected samples of white powder they found in the bakery (baking soda, baking powder, flour, cornstarch, and the unknown substance found on the body.
As well as collecting substance samples, the investigators interviewed employees of the bakery and took clothing samples to see if any employee had traces of the substance on their person.
Materials:
- baking soda
- baking powder
- flour
- cornstarch
- unknown
- vinegar
- iodine solution
- universal indicator
- water
- lab materials (beakers, stirrers, pipettes, etc)
Objective:
Identify the unknown white powder found on the assistant baker.
Procedure:
- Arrange materials
- Test powders reaction with water
- squeeze 3 drops of water into each substance
- study and record the reaction
- compare substances reactions
- Test powders reaction with vinegar
- Repeat step 2 using vinegar
- Test powders reaction with iodine
- Repeat step 2 using iodine
- Test the powders pH
- Repeat step 2 using the universal indicator
- Clean up materials
- Analyze collected data
- Finalize conclusion and complete lab sheet
Test Solutions
|
Baking Soda
|
Baking Powder
|
Flour
|
Cornstarch
|
Unknown
|
Water
|
- no reaction
|
- mildly fizzy
- mixes with water
|
- slightly sticky
- runs off
|
- changes texture
- Oobleck
- consumption
|
- mildly fizzy
|
Vinegar
|
- fizzes
|
- fizzes
|
- no reaction
|
- no reaction
|
- fizzes
|
Iodine
|
- no reaction
|
- purple/indigo
- bubbles/fizzes
|
- grayish/purple
|
- indigo/red
|
- purple/indigo
-bubbles/fizzes
|
Indicator
|
- teal
- more basic
|
- orange-yellow
- more acidic
|
- orange
-more acidic
|
- red-orange
- more acidic
|
- orange-yellow
- more acidic
|
Conclusion:
The investigators should be looking for baking soda on the suspects clothing. The unknown substances pH was the same as baking soda. The reaction of the unknown with water and the iodine solution is unique in baking soda. Before starting the experiment you could rule out many substance based on their appearance and texture when compared with the unknown. Therefore, I can conclude that the unknown substance is baking soda and the investigators should be looking for traces of it on the suspects clothing.
Great start so far guys. The layout is clean and the posts are well written. My recommendations so far mainly concern the readability of the format. The white text is slightly challenging on the black background, especially in the data table and when it is underlined. I recommend trying to outline the table and avoid underlining the white text if you can. Also, I'm a big fan of whales, but those orcas are very distracting. It's fun, but you don't want it to distract from the content.
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