Question 45
Does the ratio of the baking soda and citric acid affect the temperature change in the reaction? Work in four groups (A to D) and follow the steps.
1a. Each group mixes 2.5 g citric acid and 2.5 g baking soda. Add this mixture to 20 cm³ water.
1b. Measure and record the temperature every minute for 5 minutes.
2. Repeat steps 1a and 1b in your groups. Follow the amounts of citric acid and baking soda given in the table.
| Group | Amount of citric acid (g) | Amount of baking soda (g) |
|---|---|---|
| A | 1.0 | 2.5 |
| B | 3.0 | 5.0 |
| C | 4.0 | 5.0 |
| D | 5.0 | 7.5 |
Caution: Wear safety goggles. Wash your hands with soap and water after handling chemicals. Work in a well-ventilated area.
Describe any patterns you see in the results.
1a. Each group mixes 2.5 g citric acid and 2.5 g baking soda. Add this mixture to 20 cm³ water.
1b. Measure and record the temperature every minute for 5 minutes.
2. Repeat steps 1a and 1b in your groups. Follow the amounts of citric acid and baking soda given in the table.
| Group | Amount of citric acid (g) | Amount of baking soda (g) |
|---|---|---|
| A | 1.0 | 2.5 |
| B | 3.0 | 5.0 |
| C | 4.0 | 5.0 |
| D | 5.0 | 7.5 |
Caution: Wear safety goggles. Wash your hands with soap and water after handling chemicals. Work in a well-ventilated area.
Describe any patterns you see in the results.
