The Acidic Environment > 2. Acidic Oxides >

**Identify data, plan and perform a first-hand investigation to decarbonate soft drink and gather data to measure the mass changes involved and calculate the volume of gas released at 25˚C and 100kPa**

The volume of gas released from a quantity of soft drink at 25˚C and 100kPa can be determined using the following procedure:

- Separately measure and record the mass of a full bottle of soft drink and an empty beaker.
- Empty the bottle into a beaker.
- Measure and record the mass of the empty bottle and subtract this from the mass of the full bottle to obtain the mass of soft drink.
Add measured and recorded quantities of sugar to the soft drink until no further carbon dioxide gas is evolved.

- Measure and record the final mass of the beaker and its contents, and subtract from this the combined mass of the empty beaker and any sugar added to obtain the final mass of soft drink.
- Subtract the initial mass of soft drink from the final mass of soft drink to obtain the mass change.
- Use the mass change and the formula mass of carbon dioxide to obtain the moles of carbon dioxide gas evolved.
- Multiply the moles of carbon dioxide gas evolved by the standard volume of one mole of gas at 25˚C and 100 kPa, which is 24.79 L, to produce the volume of gas released in these conditions.