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Topic: Anhydrous and hydrated solids  (Read 3997 times)

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Offline skoozy

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Anhydrous and hydrated solids
« on: March 25, 2011, 09:43:21 AM »
When performing calculations involving masses of hydrated copper (ll) sulfate, must the water molecules be taken into account?
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Offline Borek

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Re: Anhydrous and hydrated solids
« Reply #1 on: March 25, 2011, 09:49:15 AM »
In general yes, especially when converting solid mass to number of moles.
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Offline Twigg

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Re: Anhydrous and hydrated solids
« Reply #2 on: March 25, 2011, 12:37:10 PM »
Yes. You use different molar masses for each hydrated form. The molar mass of copper sulfate pentahydrate is somewhere around 250g/mol (I think, double check that) and the molar mass of copper sulfate anhydrous is around 160g/mol. The difference is five times the molar mass of water,
5 * 18 = 90
160 + 90 = 250.
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