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When making NaCl from NaHCO3 and HCl, there are potential sources of error that can affect the yield and purity of the resulting NaCl. One common source of error is incomplete reaction between NaHCO3 and HCl, leading to a lower yield of NaCl. This can be caused by inadequate mixing or insufficient reaction time. Additionally, impurities in the starting materials or contamination during the process can also impact the purity of the final product. To overcome these issues, modifications can be made such as ensuring thorough mixing of the reactants, allowing for sufficient reaction time, using high-quality starting materials, and employing proper purification techniques to eliminate impurities.