TITLE: INVESTIGATION – Hand Warmer Design Challenge: Where does the heat come from?
PURPOSE: to determine which of the 3 ionic compounds (NaCl, LiCl, or NaCH3COO) is most suitable for use as a hand warmer
PROCEDURE:
DAY 1 (Part 2 only):
1) Measure out 2 separate samples of 100.0 mL of distilled water
2) Heat one to about 50˚C, and place other one in calorimeter (at around 20˚C)
3) Add heater water to calorimeter, cover top, wait 15 seconds, measure temp
4) Repeat
DAY 2:
1) measure 40mL of distilled water into a styrofoam cup on stir plate
2) record temp of water
3) measure out approximately 4g of salt
4) add to water and stir
5)…show more content… Julia (hour 2)
