[en_tro_py]

Hello everyone,

I was wondering whether anyone could help me with a college task I am currently struggling with..

I need to write both Rate Determining Step and Solid State Approximation to a diazotisation reaction. I can manage it by myself with the RDS, but have problems with SSA...

The mechanism is as follows:

1) H⁺  + HNO₂  H₂NO₂⁺ (fast) (k₁ - forward rate constant, k_-1 backward rate constant)
2) H₂NO₂⁺ + Br^-  ONBr + H₂O  (slow) (k₂ - forward rate constant)
3) ONBr  + C₆H₅NH₂  C₆H₅N₂⁺ + H₂O + Br^- (fast)

Experimental rate expression is r=k[H⁺][HNO₂][Br^-]

ANY help would be highly appreciated!

[mjc123]

What is the Solid State Approximation? Do you perhaps mean the Steady State Approximation?
Why don't you start by writing down what you understand to be meant by the steady state approximation, and let's see if we can work out the consequences from there?

[en_tro_py]

Oh my.. of course I mean the steady state approx. My bad!