why is 1 mol of cu2+ equivalent to 1 mol of s2o3 2-
the question is: a 0.5g sample of brass is reacted with concentrated nitric acid to form a solution containing cu2+ and zn2+ ions. the solution is then neutralised. excess KI (aq) is added. the resulting iodine solution is titrated with 0.2 mol dm3 sodium thiosulfate and 25.2cm3 are required to reach the end point calculate the percentage by mass of copper and zinc in the brass.
i got the half equations for cu2+ and thisoulfate to be:
cu2+ 2e- ----> cu
2S2O3 2- ----> S4O6 2- +2e-
as you can see from my half equations there are 2 moles of thiosulfate and 1 mole of copper
someone explain to me please
Turn on thread page Beta
redox titration- problem with the moles ? watch
- Thread Starter
- 18-10-2017 18:03
- Official Rep
- 21-10-2017 17:16
Sorry you've not had any responses about this. Are you sure you've posted in the right place? Here's a link to our subject forum which should help get you more responses if you post there.