There is no way to know for sure without further analysis, but it is likely that the solid present at the beginning and end of the reaction is the same substance.
When a solid is added to a reaction, it is referred to as the substrate or starting material. When the substrate reacts with the reactive substance, the result is the corresponding product. Therefore, even if the substrate and product may not be exactly the same material, if the reaction goes as planned, they may have the same composition. In order to determine whether our product and beginning material are the same or not, we must undergo an identification test of the substrate and product.
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