Chemistry

Can Water Float on Water?
Objective
The goal of this project is to investigate what happens to layers of waters with different densities. You will investigate density differences caused by bothtemperature and salinity.
Hypothesis
We don’t think water may float
Materials
* 4 Clear bottles with equal sized opening; 16 ounce (oz) is a good size. Bottles must have caps.
* Permanentmarker
* Laminated index or business card business card or index card
* Table salt (150 grams [g])
* 2 Containers for mixing and pouring solutions should have larger capacity than bottles.* You will also need a measuring cup capable of measuring 32 oz or 1 liter.
* Stirring spoon or stirring rod
* Teaspoon measuring spoon
* Food coloring (at least 2 different colors)* Stopwatch
* Hot and cold tap water
* Lab notebook
Procedures
1. You'll need to keep track of which containers have salt added and which ones do not, so start by labeling yourcontainers while everything is still dry. With the permanent marker label one mixing container and one bottle "+ salt." Label the other mixing container and one bottle "fresh."
2. Make your ocean waterby adding salt and water to the "+ salt" mixing container.
3. Add tap water to the "fresh" mixing container.
4. Optional: if you have a hydrometer, measure the density of each solution.
|5. Add 5 drops of food coloring to each container. Use one color for "+ salt" and a contrasting color for "fresh." Fill a "+ salt" bottle completely full with colored salt water.
6. Fill a"fresh" bottle completely full of colored fresh water.
7. Now comes the tricky part. You are going to invert (turn upside down) one bottle and put it on top of the other, without spilling.
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9. Observe what happens to the two solutions. Write your observations in your lab notebook. Remember to the note the time as you make your observations. Make an observation every minute for at...