vcemistry

[donkey]

Refer to question 2cii question from 2009 chemistry exam short answer, and the respective examiners solution. I'm sorry I haven't put up the question. This woudl be impractical since the questions requires the working of previous questions. This is all simplified in the examiners solution though so it is not much work to see it yourself too.

I understand the working out fully EXCEPT but where did the "5.6x10^-10 figure in the first step of the working come from?

[the essence]

Right here sir, page 11 of the data booklet