When a piece of marble is placed into hydrochloric acid, bubbles of carbon dioxide gas are released. Which method is used to determine the rate of the reaction?
- Acounting the number of gas bubbles formed
- Bmeasuring the diameter of the gas bubbles
- Cmeasuring the speed at which the gas bubbles rise upwards through the acid
- Dmeasuring the time taken for $10\text{ cm}^3$ of gas to be collected