Case Study:
Captain Crusoe was stranded on a deserted island and to survive, he needed to obtain fresh water.
To simulate his situation, you will be provided with some materials, and you will need to produce
not more than 10 ml of fresh water.
e
ERA
200 ml sea water
Aluminum foil (30cm x 30cm)
Cotton gloves x 1 pair
A towel x 1
10g weights x 4
Some nails
500mL Beaker x 1
250mL Beaker x 1
Tripod x1
Bunsen burner x 1
Heat proof mat x 1
L

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt