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Alternative weak acids can be used in this experiment. With such a small mass being measured out a balance of accuracy of at least ± 0.001 g is preferable. An accurate pH meter is required to get a result which bears some resemblance to the accepted value. However, even if poor results are obtained it provides a very useful opportunity to discuss the logarithmic nature of the pH scale and the sources of error.
Materials:
| Glacial ethanoic acid (1 drop) | |
| 100 cm3 beaker | 100 cm3 volumetric flask |
| pH meter (calibrated) | Balance with accuracy of at least ± 0.01 g |