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Besides the obvious of experimental loss and human error. There could be loss due to you starting product not being 100% pure, usually when trying to recover a product you are using an impure sample to start with. The next reason would be that the reaction did not go to completion. An example of this would be if you were crystallizing a product, and all some of the product did not crystallize or precipitate out. Hope this helps:)
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What can cause the percent recovery of copper to be too high?
A higher than expected percent recovery of copper could be caused by contamination in the sample leading to an overestimation of the copper content, incomplete purification steps resulting in higher apparent recovery, or errors in the analytical method used for quantification of copper. Sampling errors or improper handling of the sample could also contribute to the issue.
Would mass percent of water be too high too low or unchanged if heating was insufficient to remove all of the water from the hydrated salt?
The mass percent of water would be too high if heating was insufficient to remove all of the water from the hydrated salt, as some water would still be present in the compound.
Suppose your sample contain a volatile impurity.would your determination of percent of water in hydrate be too high or low explain your answer?
If your sample contains a volatile impurity, the determination of the percent of water in the hydrate would be too low. This is because during the heating process to remove water, the volatile impurity would also be removed, leading to a lower overall mass measurement and thus an underestimation of the water content.
If the surface of the Mg ribbon you used were covered with thin oxide coating prior to the reaction would your mass percent calculation of magnesium be too high or too low explain?
The mass percent calculation of magnesium would be too low if the Mg ribbon's surface were covered with a thin oxide coating prior to the reaction. This is because the oxide coating adds extra mass to the ribbon without contributing to the actual amount of magnesium in the sample being measured.
What problems might occur if crystallization occurs too rapidly?
If crystallization occurs too rapidly, it can result in the formation of small and irregular crystals, leading to impurities being trapped within the crystal structure. This can reduce the purity and quality of the final product. Additionally, rapid crystallization can increase the likelihood of incomplete separation of the solid crystals from the liquid solution, which can result in lower yield.
