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Topic: gravimetric determination of sulfate  (Read 8360 times)

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Offline bamster

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gravimetric determination of sulfate
« on: May 20, 2009, 04:55:15 PM »
weight of BaSO4 product is 0.1597g

find mass of SO3 in sample


i got around 0.0549 g but i don't know for sure how to do it.

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Offline ARGOS++

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Re: gravimetric determination of sulfate
« Reply #1 on: May 20, 2009, 05:13:22 PM »

Dear bamster;

It seems you did it correct!
(I got 0.05475g SO3.)

If you would like to have your method checked, then please show us your work.

Good Luck!
                    ARGOS++
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Offline bamster

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Re: gravimetric determination of sulfate
« Reply #2 on: May 20, 2009, 05:19:04 PM »
i did

0.1597 x 80.0642 g/mol SO3
                233.3906 g/mol BaSO4

= 0.0548 g


the thing i wasnt sure about is that in my book it has a ratio or something of 1 over 1 between known mass of BaSO4 and the molar mass calculation. I know it has something do if there were more SO's or something.
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Offline ARGOS++

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Re: gravimetric determination of sulfate
« Reply #3 on: May 20, 2009, 05:26:20 PM »

Dear bamster;

Your calculation is correct, because there is only one SO3 per BaSO4, so the stoichiometry tells you that the molar ratio is 1:1.

Best will be, if you can do a few other examples!
Good Luck!
                    ARGOS++
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