APFIVE Principles of Gravimetric Analysis
Consider the following data from a gravimetric analysis experiment.
| Description | Mass (g) |
|---|---|
| Unknown Alkali Hydroxide Sample | 4.33 |
| $$Cu(OH)_2$$ precipitate | 3.81 |
Reaction: $$Cu^{2+}+2\,OH^-\rightarrow Cu(OH)_2$$
All of the following statements regarding the experiment are true EXCEPT:
A
The mass of $$Cu(OH)_2$$ precipitate exceeding the original sample mass would violate conservation of mass.
B
The balanced reaction $$Cu^{2+}+2\,OH^-\rightarrow Cu(OH)_2$$ is used to relate moles of hydroxide to precipitate formed.
C
Errors in weighing the precipitate can lead to incorrect determination of the unknown compound.
D
Gravimetric analysis relies on the law of conservation of mass to correlate precipitate mass with the amount of the analyte.
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