What effect would letting a crucible and its contents dry overnight before finding their mass have on the value for the percent water in a hydrate?
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Allowing a crucible and its contents to dry overnight before finding their mass would have a significant effect on the value for the percent water in a hydrate.
When determining the percent water in a hydrate, the process involves heating the hydrate to remove the water of hydration. This is typically done by heating the hydrate in a crucible. The crucible and its contents, including the hydrate, are weighed before and after heating to find the mass of water lost.
However, if you allow the crucible and its contents to dry overnight before finding their mass, it means that any remaining water in the hydrate would have already evaporated. This would result in an inaccurately low measurement of the mass of water lost during heating.
The purpose of finding the percent water in a hydrate is to determine the ratio of water to the anhydrous compound within it. Allowing the crucible and hydrate to dry overnight in advance would alter this ratio, leading to an underestimation of the percent water content. As a result, the calculated value for the percent water would be lower than it actually is.
To obtain accurate measurements for the percent water in a hydrate, it is important to weigh the crucible and contents immediately before and after heating, without allowing them to dry in advance. This ensures that the full amount of water is captured and accounted for, leading to a more precise determination of the percent water in the hydrate.