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November 01, 2025, 12:52:49 pm
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Author Topic: STAV 2012  (Read 558 times)  Share 

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Somye

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STAV 2012
« on: June 09, 2012, 07:39:43 pm »
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I was doing the last question (Q10) where it says that a sample will have a percentage purity of BaCl2 of about 85%, and the max mass that the student can collect is 1.5g

The last step of the answers was dividing the mass of BaCl2 by .85, but by my reasoning, if you assumed the percentage purity was 85% and it turned out to be 87% for example, you wouldn't be able to collect all your precipitate?

Any clarification would be helpful! (sorry for the poor wording)
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oneoneoneone

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Re: STAV 2012
« Reply #1 on: June 09, 2012, 07:42:40 pm »
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Yeah its a bit of a dodgy question. Really, you should only do the 19.5g (or what it was) so that if it happened to be 100% pure you wouldn't run into any issues.
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rebeckab

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Re: STAV 2012
« Reply #2 on: June 09, 2012, 08:24:58 pm »
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That's what I thought.. but I assumed my logic was stupid so just left it :/ I'm glad I'm not the only one
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