Hello people! Today we going to do the Rainbow Lab. Last time we try out the Density Lab to see how density work and how is it useful in nature. So by using density we going to make a rainbow.
- Prepare Materials
+ 1- 100ml Graduated Cylinder
+ 150 ml Beakers
+ Pipette
+ Sheet of background paper
+ White kosher salt
+ Food coloring
+ Water
Solution # lll Salt (g) lll Water (mL) lll Food coloring (drops)
1 16.0 60 2- Blue
2 11.7 60 2- Green
3 7.20 60 2- Yellow
4 3.40 60 1- Yellow, 1- Red
5 0.00 60 2- Red
1 16.0 60 2- Blue
2 11.7 60 2- Green
3 7.20 60 2- Yellow
4 3.40 60 1- Yellow, 1- Red
5 0.00 60 2- Red
Step 1: Using your pipette, slowly draw up the solution. Place 20 mL of each solution in the 150 mL beaker. For the second, third, fourth, and fifth solutions, place the pipette along the inside of the beaker near the previous layer of solution, but not touching it. Drop the next solution drop by drop, gently allowing it to roll down the side. Rinse the pipette thoroughly between solutions with clean and clear water.
RESULT
Tadaaah! Looks cool right??
Calculations:
Solution #:
Solution #:
- Mass of Solution: 76 g lll Density of Solution: 1.27 g/mL
- Mass of Solution: 71.7 g lll Density of Solution: 1.20 g/mL
- Mass of Solution: 67.2 g lll Density of Solution: 1.12 g/mL
- Mass of Solution: 63.4 g lll Density of Solution: 1.06 g/mL
- Mass of Solution: 60 g lll Density of Solution: 1 g/mL
Conclusions:
1. If all of the solutions were made with just slat and water, why did they form different layers?
All solutions were made with just salt and water though each layer has different densities. Depends the water has the less density so it is at the more top and the more density so it will sink more down at the bottom.
2. The ocean contains water with different salinities. Where do you think the saltiest layers would be found? Why?
I think the the saltiest layers would be found in the bottom of the ocean, because the salt is really dense. The more dense something is, it will sink.
3. What happens to density as temperature changes?
If the temperature changes, the density can decrease or increase (cold or hot).
4. Where in the ocean water column would you except to find warm, fresh water? Where could you find colder, saltier water? Explain why?
When the temperature is cold the density increases, and if the temperature is warm then the density decreases. The warm water would be at the top and the cold water is at the bottom. So you would find warm, fresh water at the surface because it has less density, warm thermocline, and salinity. The cold, salt water is found in the bottom because it has more salinity, density, and cold thermocline.
1. If all of the solutions were made with just slat and water, why did they form different layers?
All solutions were made with just salt and water though each layer has different densities. Depends the water has the less density so it is at the more top and the more density so it will sink more down at the bottom.
2. The ocean contains water with different salinities. Where do you think the saltiest layers would be found? Why?
I think the the saltiest layers would be found in the bottom of the ocean, because the salt is really dense. The more dense something is, it will sink.
3. What happens to density as temperature changes?
If the temperature changes, the density can decrease or increase (cold or hot).
4. Where in the ocean water column would you except to find warm, fresh water? Where could you find colder, saltier water? Explain why?
When the temperature is cold the density increases, and if the temperature is warm then the density decreases. The warm water would be at the top and the cold water is at the bottom. So you would find warm, fresh water at the surface because it has less density, warm thermocline, and salinity. The cold, salt water is found in the bottom because it has more salinity, density, and cold thermocline.