How to avoid errors when changing a hydrate to anhydride?

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In summary, when changing a hydrate to an anhydrous, possible unavoidable errors include picking up water vapor from the air, contaminants on the crucible affecting mass measurements, and the possibility of other materials being driven off during heating. This procedure may not work for all hydrates, particularly those with low boiling points.
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dodgers42
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what are the possible unavoidable errors when changing a hydrate to an anhydrous. the procedure called for heating the hydrate in a crucible a few times and cooling to room temp in a desiccator until mass measured was constant. also why wouldn't this procedure work for all hydrates? thank you for help.
 
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This procedure is fine enough way to do it, all you are doing is evaporating the water until all of it is gone (mass doesn't change, all water is gone).

I could see it not working in the case that you have a hydrate that also has a low boiling point, and would cause it to evaporate too.
 
  • #3
After heating the hydrate to drive off the water, it is possible that the anhydrous would pick up water vapor from the air.
Also, there could be material (various dust particles, fingerprints, etc) on the crucible after heating it which would cause mass differences (depending on the precision of the balance.)
It is also possible that more than water is driven off when heating the crucible.
Although without viewing the actual procedure, it is hard to be certain on the sources of error.
 

1. What is a hydrate and anhydride?

A hydrate is a compound that contains water molecules in its crystal structure. An anhydride, on the other hand, is a compound that has had all of its water molecules removed.

2. Why is it important to avoid errors when changing a hydrate to anhydride?

Errors during this process can lead to inaccurate results or incomplete conversion, which can affect the purity and effectiveness of the final product.

3. What are some common errors that can occur during this process?

Common errors include incorrect measurement of ingredients, inadequate drying techniques, and insufficient heating or cooling times.

4. How can I ensure accuracy when changing a hydrate to anhydride?

To avoid errors, it is important to carefully measure all ingredients, properly dry the hydrate, and follow the recommended heating and cooling times and temperatures.

5. Are there any precautions I should take when working with hydrates and anhydrides?

Yes, it is important to handle these compounds with caution as they can be hazardous to health. Always wear appropriate protective equipment and work in a well-ventilated area.

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