Legend3107 Posted December 11, 2017 Report Share Posted December 11, 2017 (edited) I am basically testing for iron content in different vegetables. I dissolve 30g of each vegetable in sulphuric acid and then titrate it against KMnO4. Basically I need help coming up with a scientific explanation on why I need to keep the mass of the vegetables and sulphuric acid a constant for each experiment. I know it's a dumb question but I just want to be sure and not lose any dumb marks. Edited December 11, 2017 by Legend3107 Reply Link to post Share on other sites More sharing options...
yara560 Posted December 12, 2017 Report Share Posted December 12, 2017 Correct me if I'm wrong, but I think you'd say something like if you have varying masses of the vegetables this could result in varying iron contents, therefore directly affecting your research/data. For the sulphuric acid, if you have varying volumes/ different types of acid this will again affect the titration values and how the vegetables are dissolved?? Reply Link to post Share on other sites More sharing options...
kw0573 Posted December 12, 2017 Report Share Posted December 12, 2017 It's very dangerous to use strong acid as a solvent: usually you just need few drops. I would guess it has something to do with acid breaking down cell walls. Make sure your method is checked by your teacher. Reply Link to post Share on other sites More sharing options...
kanda_sorata Posted December 12, 2017 Report Share Posted December 12, 2017 19 hours ago, yara560 said: Correct me if I'm wrong, but I think you'd say something like if you have varying masses of the vegetables this could result in varying iron contents, therefore directly affecting your research/data. For the sulphuric acid, if you have varying volumes/ different types of acid this will again affect the titration values and how the vegetables are dissolved?? Yeah, I agree. 2 hours ago, kw0573 said: It's very dangerous to use strong acid as a solvent: usually you just need few drops. I would guess it has something to do with acid breaking down cell walls. Make sure your method is checked by your teacher. I'm pretty sure he's not using 1 M sulfuric acid Reply Link to post Share on other sites More sharing options...
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