A student determines the number of moles of water in a hydrated metal oxide by weighing a clean, dry — Laboratory Techniques Chemistry Question
Question
A student determines the number of moles of water in a hydrated metal oxide by weighing a clean, dry crucible and lid while the crucible is empty, then reweighing the crucible and lid with a sample of the hydrate, heating the crucible and lid with a Bunsen burner and then reweighing the crucible and lid with the sample after cooling to room temperature. Which error will result in too high a value for the amount of water of hydration?
The heating is conducted only once instead of the three times recommended by the procedure.
The lid is left off the crucible when it is weighed with the hydrated oxide.
The metal oxide reacts partially with oxygen in the air, forming a compound in a higher oxidation state.
Some of the heated oxide is spilled from the crucible before it can be weighed.