Logged out
Access All our Essays in an Instant
Swap your work for FREE access, or pay £4.99 for instant access
Determining activation energy (Ea) of a reaction.
Member rating:
(2 votes)
| Words:
| Submitted: Mon Jun 28 2004
Page Preview
On the left is an image preview of every page of this document, and below are the first 150 words with formatting removed:
Determining activation energy (Ea) of a reaction (c) KCl http://hk.geocities.com/fatherofchemistry Objective To determine the activation energy for the reduction of peroxodisulphate(VI) ions. S2O82-, by iodide ions I-, using a 'clock' reaction. Principle The equation for reduction of S2O82- by I- is: S2O82- + 2I- › 2SO42- + I2 The formation of iodine is 'monitored' by small & known amount of thiosulphate ions, S2O32-: 2S2O32- + I2 › S4O62- + 2I- Once the reactants are mixed, the stop-watch is started. At the time when all of the thiosulphate is reacted, any free iodine produced will turn starch solution (added before) into dark-blue, the time is then recorded. The amount of thiosulphate added monitors the time in which starch turns blue and the reaction rate is directly proportional to 1 ÷ time taken for starch changes to dark blue. By plotting a graph of log10(1/t) against 1/T (T=absolute temperature), activation energy (Ea) can be found. Chemicals ...
Get instant access
- Instant, unlimited access to our documents in full
- Swap your work for free access, or pay £4.99
- To see the full version of this document and 146,186 others
Receive email updates for this category
- Simply tell us your email address and receive a weekly Study Help Email for FREE
- Receive 3 FREE essay views with each email
- Get all the latest essays from Coursework.Info & discussion from TheStudentRoom.co.uk
