How could you establish the formula of #ZnSO_4*7H_2O#?
How would you show that it is the
Possibly, the best means would be by complexometry.
So, perhaps you would take thesalt,
You could use heat to remove the cristal water.
If you weigh an amount of hydrate and heat it (not too hot!) untill the weigh stays constant, then:
End weight represents anhydrous
Weight loss represents the cristal water removed, which you also convert to mols.
The ratio of the two gives you the
There are three ways this can go wrong:
(1) If you don't heat long enough, not all the water will be gone, and you'll end up with a lower number for
(2) If the sample of hydrated salt is already partly dehydrated, you'll also get an
(3) If you heat too long, or too hot, part of the zinc sulphate may disintegrate: