B. Sodium hydrogen carbonate solution and citric acid 1. Pour 40 cm3
of sodium hydrogen carbonate solution into a paper cup.
2. Record the temperature. 3. Add four spatula tips of citric acid to the sodium hydrogen carbonate solution. 4. Record the maximum or minimum temperature reached.
Questions (a) Did the temperature rise or fall? (b) Is this reaction exothermic or endothermic?
C. Copper sulfate solution and magnesium powder 1. Pour 40 cm3
of copper sulfate solution into a paper cup.
2. Record the temperature. 3. Add four spatula tips of magnesium powder to the copper sulfate solution. 4. Record the maximum or minimum temperature reached.
Questions (a) Did the temperature rise or fall? (b) Is this reaction exothermic or endothermic?
D. Sulfuric acid and magnesium ribbon 1. Pour 40 cm3
of dilute sulfuric acid into a paper cup.
2. Record the temperature. 3. Add 6 cm of magnesium ribbon to the sulfuric acid. 4. Record the maximum or minimum temperature reached.
Questions (a) Did the temperature rise or fall? (b) Is this reaction exothermic or endothermic?
Results table Reactants
Sodium hydroxide and hydrochloric acid
Sodium hydrogen carbonate and citric acid Copper sulfate and magnesium powder Sulfuric acid and magnesium ribbon
Start
temperature temperature temperature exothermic or endothermic?