[sodium.dioxid]

Do they undergo a constant half-life? Is half-life even applicable to them?

[ramboacid]

S_N1 reactions are first order, just like exponential decay reactions. Does that help?

I don't see why you can't have a half life for any reaction, though it may be awkward to think about at first because it is usually discussed with exponential decay.

[sodium.dioxid]

S_N1 reactions are first order, just like exponential decay reactions. Does that help?

So, by default, you are saying that the half life of SN1 is constant.

[ramboacid]

That's what I would think. What I've heard is that any 1^st order reaction has a half-life of [itex]t_{1/2} = \frac{\ln{(2)}}{k}[/itex], where k is the rate constant. So I guess it applies to S_N1 as well.

[sodium.dioxid]

That's what I would think. What I've heard is that any 1^st order reaction has a half-life of [itex]t_{1/2} = \frac{\ln{(2)}}{k}[/itex], where k is the rate constant. So I guess it applies to S_N1 as well.

I was thinking the same thing here.