A level chem. questions

• Jia Xun

  26 Feb 12, 01:52

  10cm^3 of a solution containing 0.800mol.dm^-3 of MnO4- ions were mixed with 10.0cm^3 of a 15.0moldm^-3 solution of hydrogen peroxide.Calculate the volume of oxygen that will be liberated at s.t.p

   

  A 16.5 cm^3 solution of acidified potassium dichromate of concentration 0.101moldm^-3 is reacted with a solution containing Fe^2+.What volume of a 0.500moldm^-3 concentration of Fe2+ solution will be required for a complete reaction?

   

  Hmm...How do I go about these questiond and also on back titration and endometric titration?Thanks in advance.:)

• Darkness_hacker99

  26 Feb 12, 02:36

  1) Write out the balance chemical equation

  2) convert your values to mol.

  3) work out the proportion of each reactant

   show us your attempts, and we'll go on from there

   

   

  Back titration

  http://www.youtube.com/watch?v=J91n8RUkhKc

  http://www.youtube.com/watch?v=blRTY3f7Lx8&feature=related

   

  Endometric