Chemical Reactions: How to Make a Salt
Questions: What are some common properties of salts? What is the difference between a chemical reaction and a physical reaction? How can we make a salt chemically?
Materials: 2 Ziploc bags with Calcium Chloride (CaCl2), 2 vials of 30mL Phenol Red (red water), 2 magnifiers, 2 thermometers, 2 vials of 20mL Baking Soda (NaHCO3), Clock, Lab worksheet (2-sided)
Procedures:
A.) You will be working in groups of two to three per table. (Materials per group).
B.) Follow ALL procedures on lab worksheet. Your teacher will guide you through each step of lab.
1.) Carefully lift lid of “red water” vial and put thermometer in vial. Get temperature in Celsius.
2.) Observe chemical compound CaCl2 in bag. Use magnifiers. Describe and name element parts.
3.) Observe chemical compound NaHCO3. Use magnifiers. Describe and name element parts.
4.) Add 15mL (½) of colored water to the vial of NaHCO3. Describe color of mixture.
5.) Put thermometer in bag with CaCl2 – make sure numbers are facing on bottom of bag.
6.) Look at chart on graph on back of lab worksheet to learn how to record temperature change. (Beginning temperature is the reading from step #1)
7.) Watch clock to time the reaction. Put 15mL (remaining ½) of red water in bag. Seal it. What is the color of this mixture?
8.) Check temperature every 30 seconds and record temperature on your chart.
9.) After 3 minutes, shake the capped vial of NaHCO3 with red water and pour contents quickly into the bag. SEAL THE BAG QUICKLY!
10.) Check temperature every 30 seconds and record temperature on your chart.
11.) Pour Ziploc contents into a jar with a coffee filtered jar.