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Title: Fractional Crystallization Post by: siustrulka on Mar 17, 2011 1d. determine the number of grams of water required at 100 Celsius to dissolve a mixture containing 20 g KNO3 and 2.0 g CuSO4*5H20 assuming that the solubility of one substance is not affected by the presence of another.
2. to the solution in Problem 1d at 100 Celsius, 15g of water are added and the solution is cooled to 0 Celsius a. How much KNO3 remains in solution (see figure 1 http://img36.imageshack.us/i/pichj.png/ (http://img36.imageshack.us/i/pichj.png/)) b. How much KNO3 crystallizes out? c. How much CuSO4*5 H2O crystallizes out? d What percent of the KNO3 in the sample is recovered? Title: Re: Fractional Crystallization Post by: lewis on Mar 18, 2011 To solve this problem, you need the solubilty data of KNO3 in water from 0 to 100 C. To determine mass which crystallizes out, subtract the solubility of KNO3 at the lower temperature from that at the higher temperature.
I think the following writeup may help you Title: Re: Fractional Crystallization Post by: toni_malvina on Mar 23, 2011 structure of cells
Title: Re: Fractional Crystallization Post by: bio_man on Mar 23, 2011 Is this problem solved? Please mark it as solved.
Title: Re: Fractional Crystallization Post by: lacadasical on Sep 12, 2011 i assume it is solved? i am neew and can not tell if it is marked as solved
Title: Re: Fractional Crystallization Post by: bio_man on Sep 12, 2011 i assume it is solved? i am neew and can not tell if it is marked as solved Hasn't been marked as solved yet... Title: Re: Fractional Crystallization Post by: robertling on Sep 25, 2011 Does this help :-\ ?
Title: Re: Fractional Crystallization Post by: duddy on Sep 25, 2011 Title: Re: Fractional Crystallization Post by: abbyl7714 on Oct 19, 2011 add the first amount of water (in grams) to the added amount of water and multiply by .1 (because 10g/100ml) then subtract that amount from the given amount...that is your amount of KNO3 crystallized.
Title: Re: Fractional Crystallization Post by: megan.bara on Oct 23, 2011 What percent of KNO3 in the sample is recovered?
Title: Re: Fractional Crystallization Post by: jorgepe2 on Oct 26, 2011 subtract to find out the precipitate
Title: Re: Fractional Crystallization Post by: alease on Oct 30, 2011 This problem is confusing to all of the chem students.... our values are different though.
Title: Re: Fractional Crystallization Post by: biolove on Oct 30, 2011 This problem is confusing to all of the chem students.... our values are different though. What did you get? Could you show us the solution :-\... Title: Re: Fractional Crystallization Post by: alease on Oct 30, 2011 This problem is confusing to all of the chem students.... our values are different though. What did you get? Could you show us the solution :-\... Our problem looks like the thumbnail from the first page, but we don't even know where to start on part two! Do you have any idea how to work this problem out? Title: Re: Fractional Crystallization Post by: hoangyen85 on Jan 25, 2012 CuSO4*5H2O: 203.3g dissolves in 100 cu cm water at 100C
Title: Re: Fractional Crystallization Post by: Leen on May 16, 2012 is it answered ?
Title: Re: Fractional Crystallization Post by: BearPro on May 16, 2012 is it answered ? Yeah, is it answered? This thread is like an year old and still it is getting replies. Title: Re: Fractional Crystallization Post by: willerz2 on Sep 17, 2012 What is the initial KNO3 that's required for part A? Is it still 25g like its given or did it dissolve
Title: Re: Fractional Crystallization Post by: bio_man on Sep 17, 2012 What is the initial KNO3 that's required for part A? Is it still 25g like its given or did it dissolve Did you find answers to the other questions? Title: Re: Fractional Crystallization Post by: MIMI98 on Sep 19, 2012 what about 10g of water instead of 15g?
Title: Re: Fractional Crystallization Post by: mabgrw on Oct 10, 2012 Thank you, I've been looking for this for so long... :)
Title: Re: Fractional Crystallization Post by: John Rivera on Sep 15, 2013 How would u find the conversion factor at 0 degrees??
Title: Re: Fractional Crystallization Post by: BurritoBob on Sep 15, 2013 I'm assuming at 0C, we should use 10 and 20 as the amount
Title: Re: Fractional Crystallization Post by: andy351035 on Oct 10, 2013 so how after you find the masses what do u do next to find out the out much solution remains
Title: Re: Fractional Crystallization Post by: jovanyd on Dec 15, 2013 To determine mass which crystallizes out, subtract the solubility of KNO3 at the lower temperature from that at the higher temperature.
Title: Re: Fractional Crystallization Post by: xAKULAx on Feb 6, 2014 How do you do this? I'm still slightly confused, I understand you need to setup ratios, but not exactly what.
Title: Re: Fractional Crystallization Post by: iMMORTAL153 on Sep 12, 2014 Problem has been solved close this thread.
Title: Re: Fractional Crystallization Post by: bonesMac on Sep 19, 2014 Content hidden
Title: Re: Fractional Crystallization Post by: johnyv17 on Sep 24, 2014 Question 2 part do is a percentage question. Your answer shouldn't be in grams
Title: Re: Fractional Crystallization Post by: jgrins on Oct 7, 2014 Been stuck on this for awhile now, the lab itself doesn't explain anything enough for you to be able to do a pre-lab. Thank you so much for this.
Title: Re: Fractional Crystallization Post by: syeda on Sep 30, 2020 no idea how to solve it
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