Turn on thread page Beta
    • Thread Starter

    0.500g of bronze was reacted with nitric acid giving a Cu2+*solution.* The solution was reacted with iodide ions, I-*forming a solution of iodine, I2.

    This iodine solution*was then titrated with 0.200 mol dm-3*solution of sodium thiosulphate, 22.40cm3*of this was required.

    Calculate the % by mass of copper in bronze

    I did 0.2*(22.40/1000) = 0.00448 which were the moles of thiosulphate which I then divide by 2 to get moles of I2.

    Now that I have moles of I2 - this gives me the moles of Cu2+ which I multiple the mols of I2 by 2 to get. then I do 63.5*mol of Cu2+ to give me mass of copper. Then mass of copper/0.5 * 100 to get percentage composition? Is this method correct?

    (Original post by MrToodles4)
    Is this method correct?
    Your route through the problem is correct, it is just your molar ratios are a bit squiffy.

    Can you show us your balanced overall reactions between Cu2+ and I- and between I- and S2O32-?
Submit reply
Turn on thread page Beta
Updated: February 18, 2018

University open days

  1. Norwich University of the Arts
    Postgraduate Open Days Postgraduate
    Thu, 19 Jul '18
  2. University of Sunderland
    Postgraduate Open Day Postgraduate
    Thu, 19 Jul '18
  3. Plymouth College of Art
    All MA Programmes Postgraduate
    Thu, 19 Jul '18
Is the Big Bang theory correct?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.