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Study Plan for Practical Work
The mass loss method allows the use of data logging if you have a suitable balance and software.
The gas volume method can give some very good half-life graphs, although it is not uncommon to see students getting results with a decreasing half-life. It is worth stressing the value of the gas syringe and trying to avoid them being dropped or crushed in a clamp!
Materials:
| Marble chips (10 g) | 1 M hydrochloric acid (20 cm3) |
| Side arm test tube | Bung to fit side arm test tube |
| 100 cm3 gas syringe | 100 cm3 conical flask |
| Balance with accuracy of at least ± 0.01 g | Cotton wool |