Question 27
In this experiment, put on safety goggles and gloves. Put 100 ml of water into each of three identical cups A, B and C. Keep A at room temperature, B in a warm water bath (about 40 °C) for 5 minutes, and C in an ice bath (about 0 °C) for 5 minutes. Add one effervescent tablet to each cup in turn, start the stopwatch immediately, stir briefly, and observe the fizzing. Keep each cup at its specified temperature during the reaction. Time how long the tablet takes to dissolve completely.
Record your observations in the table. Record the time taken for the tablet to completely dissolve in the table.
| Cup | Temperature | Intensity of fizzing (high/medium/low) | Reaction time (seconds) |
|---|---|---|---|
| A | Room temperature | … | … |
| B | Warm (40 °C) | … | … |
| C | Cold (0 °C) | … | … |
Record your observations in the table. Record the time taken for the tablet to completely dissolve in the table.
| Cup | Temperature | Intensity of fizzing (high/medium/low) | Reaction time (seconds) |
|---|---|---|---|
| A | Room temperature | … | … |
| B | Warm (40 °C) | … | … |
| C | Cold (0 °C) | … | … |
