Discussion on the Source of Experimental Error
For those who have tested calcium carbonate, the source of the error covers multiple ends. The first to bear the brunt is the precision of the instrument. Measurement tools, if the balance, the genus of the measuring cylinder, its division value is established, subtle differences, add up to more, will lead to biased results. Such as the error of the balance, the loss of a millimeter, in the weighing of the drug, the impact is not shallow.

Furthermore, the purity of the drug is also the key. The calcium carbonate used may contain impurities, the nature of impurities, or related to the reaction, or not. If it is related to the reaction, it will interfere with the reaction process and make the results different from expectations; if not related, it will also increase or decrease the actual content of the drug, resulting in experimental bias.

Whether the operation is standardized or not also affects the error. During the reaction, the degree of heating, the speed of stirring, and the length of the reaction are all fixed. If the heating is too intense, the drug may decompose too much; if the stirring is uneven, the reaction will not be complete; if the time is short, the reaction will not be completed, and errors will be introduced.

Changes in the environment cannot be ignored. Differences in temperature and humidity have an impact on the reaction rate and the state of the substance. Under high temperature, the solubility of the gas decreases, and the amount of escape may change; if the humidity is different, the degree of moisture absorption of the drug will vary, and the quality will change accordingly.

At the end, the recording and processing of data is also where errors breed. When reading, parallax is inevitable, records are careless, and numbers are wrong; processing data, improper methods, and biased algorithms can all lead to errors in the final result.

Therefore, in order to ensure the accuracy of the experiment, it is necessary to carefully investigate the sources of errors, operate the instruments carefully, strictly select drugs, standardize operations, pay attention to the environment, and carefully analyze the data in order to approach the realm of accuracy.