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  1. K

    Does Le chatlier's law apply if reactants are liquids and a product is solid?

    I appreciate that!, But unfortunately i'm just a 12th grader and I don't have that kind of stuff.
  2. K

    Does Le chatlier's law apply if reactants are liquids and a product is solid?

    Oh god, alas, another experiment down the drain.. Thank you!
  3. K

    Does Le chatlier's law apply if reactants are liquids and a product is solid?

    Sorry, before I go ahead, Is the reaction reversible? I seem to have made a stupid assumption that I can talk about the equilibrium shifting to remove excess reactants when it mayn't be a reversible reaction. How do I know if it is one? THanks Borek
  4. K

    Does Le chatlier's law apply if reactants are liquids and a product is solid?

    Hi So the reaction is below: Sodium thiosulfate + HCl = Sulfur + NaCl+ Water+ SO2 So if I wanted to say 'Increasing the conc. of Sodium thiosulfate has shifted the equilibrium to the left (reactants) and thus the system works to break down excess reactants and create more product by...
  5. K

    How to determine zinc in a plant.

    Talk about luck haha! My mum's been teaching german for 15 years, however, A complexing agent I did come across was zincon, which was holy costly!! Yes, so sorry for the late up date. But I'm going with AAS since I can't find a complexing agent other than zincon for zinc.
  6. K

    How to determine zinc in a plant.

    Sorry, that's beyond me! :O I'm just a 17 year old guy! Please sympathize with me, this is tough enough with so much chemistry that's waay about my level!
  7. K

    How to determine zinc in a plant.

    Urgent: Some complexing agents for zinc. Hi, I am to extract Zinc from plant tissue, with 0.1N HCl. But since its colorless I cannot determine the concentration(using the colorimeter) of zinc without adding a chemical that forms a complex with zinc and has a color.
  8. K

    How to determine zinc in a plant.

    How would you extract zinc from a plant? Hi! So I basically need to find out how I'm supposed to extract zinc from a plant and its methodology and chemicals required. How do I do this? I found one article that is rather incomplete, it just says zinc was extracted using 0.1N HCl and not...
  9. K

    Caculating the enthalpy change of reaction from delta T values(experimentally)

    Well, turns out I won't need to flip the sign. However I have hardly varied my independant variable hence I must perform the experiment with 0.025 M, 0.05M, 0.1M, 0.2M, 0.4M masses of the chemicals. That will indicate efficiency in a better manner, you know may be I could calculate the average...
  10. K

    How to determine zinc in a plant.

    Woops! ignore my ignorance, I was just told that, well doesn't the AAS give you the concentration directly? Gosh, just pointless maches *argh* CHANGE: AAS or COLORIMETER
  11. K

    How to determine zinc in a plant.

    Which would you prefer? I'm calculating the amount of zinc absorbed by a particular plant (yes, in theory it does accumulate zinc- B.Juncea).
  12. K

    Caculating the enthalpy change of reaction from delta T values(experimentally)

    I hope I can drop the formality. But Dude! measuring the initial temperature would mean measuring the temperature of water at room temperature? Oh and I was told I had the wrong answer because 0.025 mols does NOT represent 1 mol obviously and so my units in actuality weren't kJ/mol but...
  13. K

    Caculating the enthalpy change of reaction from delta T values(experimentally)

    Hmm, I think I went wrong when I was told to take 0.025 moles and 50 cm3 without any damn reason. Okay, I measured the temperatures only after I added water, that's the reason the values are negative. but in that case the enthalpy won't be negative when it IS an exothermic reaction.
  14. K

    Caculating the enthalpy change of reaction from delta T values(experimentally)

    Okay my bad, first off can you suggest how you would carry out this experiment? Here are the reactions for the hydration of CuSO4: 1)CuSO4(s) + Aq -----> CuSO4(aq) ∆H reaction What I got for ∆H reaction= -2kJ/mol Theoretical: -66.5 kJ/mol 2)CuSO4(s) -----> CuSO4.5H20(s) ∆H reaction...
  15. K

    Caculating the enthalpy change of reaction from delta T values(experimentally)

    Hi! Thanks for your interest in this this post :D! So two reactions I performed were: A) Adding 50 cm3 water to 0.025 moles CuS04 and measuring ΔT. B) Adding 50 cm3 water to 0.025 moles CuS04.5H2O and measuring ΔT. Well turns out the calculations were wrong, since I apparently didn't get...
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