2.1 Equipment List
- Cold tap water
- Beaker (2, 250ml each)
- 1 Blender
- Wax paper (1 sheet)
- Food coloring, any color (5 drops)
- Bowls (3)
- Spoons (7)
- Plastic wrap
- Timer, stopwatch, or clock that shows seconds
- Digital scale with 0.1-g increments.
- 60 cc plastic syringe
- Sodium alginate (2 grams)
- Calcium chloride (4 grams)
- Sodium citrate (6 grams)
- Paper towel
2.2 Diagrams of experimental setup
Firstly we made the sodium alginate solution with the 120ml of water, 2g of sodium alginate, food colouring and blender.
Next we labelled 3 bowls with 0%, 1% and 1.5%. Then we added 240 ml of water into each bowl with 1.3g of calcium chloride.
Then we added 2.4g of sodium alginate into the bowl of 1% and 3.6g into the bowl of 1.5%.
Next we stirred each bowl with a glass rod till the chemicals dissolve.
We then make the sodium alginate balls with the solution labelled 0%
After, we put the sodium alginate balls into the solutions labelled 1% and 1.5%, and after 60 seconds, removed it and measured its size.
2.4 Risk Assessment and Management
Experiment involves a blender and we may cut ourselves when handling the sharp parts of the blender and may involve glassware and we need to take care when handling it. In the event that the glassware breaks, immediately inform to a teacher and record in the Incident Report form. Chemicals or solutions might spill onto table and cause irritation to other students using the lab or get into eyes and cause irritation etc. To prevent this, we must wear goggles or gloves and wipe the table clean before the next class comes into the lab.
2.5 Data Analysis (Nicole)
The sodium alginate balls coagulated almost instantly in the solution without any sodium citrate. However, the sodium alginate balls will coagulate at a slower rate in the 1% solution and does not coagulate in the 1.5% solution. This proves that when the amount sodium citrate increases, the rate of coagulation will decrease.