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Something to do with iodometry...need help

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  • limywv
    limywv's Avatar
    930 posts since Dec '06
    • 24 Jan `08, 8:54PM

      Hey guys i've a question to ask...ok here it is:

      25 cm³ of a copper (II) sulphate solution was added to 30cm³ of potassium iodide solution which was in excess.

      the iodine liberated was titrated with 22,5 cm³ of 0,1080 mol dm^-3 sodium thiosulphate solution. what was the mass in grams of the pentahdydrate, CuSO4.5H2O per dm³ of the solution?

      guys thanks..

      -- edited to change from CuSO3.5H2O to CuSO4.5H2O

      Edited by eagle 24 Jan `08, 10:34PM
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    eagle
    eagle's Avatar
    16,365 posts since Aug '01
  • limywv
    limywv's Avatar
    930 posts since Dec '06
  • Moderator
    eagle
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    16,365 posts since Aug '01
    • 24 Jan `08, 10:24PM

      you haven’t reply got answer a not… Guideline is, please put answer if there is. It would be polite to state so too if there’s no answer

  • limywv
    limywv's Avatar
    930 posts since Dec '06
  • starmoonsun
    starmoonsun's Avatar
    59 posts since Jul '07
    • 24 Jan `08, 10:39PM

      write the ionic eqn:

      Cu^2+ + 2I^- > Cu + I2

      22.5/1000*0.1080 = 0.00243

      0.00243/2 = 0.001215

      0.001215/25*1000=0.0486 mol/dm3

      mr = 54+32+64+90=240

      240*0.0486 = 11.7g/dm3

      not very sure...

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