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Topic: HYDRATES (help)  (Read 4829 times)

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Offline Sabrina123

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HYDRATES (help)
« on: November 01, 2007, 08:18:46 PM »
PLEASE HELP..

1) A 5.00 g sample of borax (sodium tetraborate decahydrate, Na2B4O7.10H2O)
was thoroughly heated to remove all the water of hydration. what mass of anhydrous sodium tetraborate  remained?

how do you find anhydrous mass?
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Offline Padfoot

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Re: HYDRATES (help)
« Reply #1 on: November 01, 2007, 08:45:10 PM »
First step is to calculate the percentage by mass of H20 in Borax.
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Offline Sabrina123

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Re: HYDRATES (help)
« Reply #2 on: November 01, 2007, 09:01:37 PM »
ok go onn.. :-\
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Offline Borek

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Re: HYDRATES (help)
« Reply #3 on: November 02, 2007, 04:57:26 AM »
It can be done in many ways. You may for example start with reaction equation. Or you may do as Padfoot suggests. In all cases you will have to compare molar mass of hydrated substance with that of anhydrous. What are molar masses of both substances?
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