Wednesday, 2 December 2009
An excellent example of a displacement reaction
The aim was to turn the copper black. It worked but then sadly the 'black' rubbed off under water - not a good look on a rainy day. So I spent most of the class scrubbing the blackness off to the point where it now looks exactly the same as it did last week!
On a happier note I did manage to turn the small central bit (or carpel, if like Elanor you majored in biology) black using another dodgy looking solution. The addition of a pin is also critical to the effectiveness of the piece.
Next week I'll be putting the leaves in the dodgy solution (wish I could remember all that chemistry I did at school) and hopefully finishing off...