Question 28
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.
In which cup was the reaction the fastest? Explain your answer.
In which cup was the reaction the fastest? Explain your answer.
