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### Half-Life 1st Order Reaction

Posted: Wed Mar 06, 2019 10:44 am
Is the equation t1/2 = 0.693/k valid for all first order reactions? And if so, it it because the initial concentration of A cancel out and leave ln(1/2)?

### Re: Half-Life 1st Order Reaction

Posted: Wed Mar 06, 2019 12:39 pm
Yes, that's exactly correct.

### Re: Half-Life 1st Order Reaction

Posted: Thu Mar 07, 2019 12:19 pm
Also remember that you can always derive this equation it you have any doubts

### Re: Half-Life 1st Order Reaction

Posted: Thu Mar 07, 2019 1:30 pm
For the first order
the half life equation is t(1/2)= ln2/k.
It is applicable to all first order rate reactions.

### Re: Half-Life 1st Order Reaction

Posted: Sat Mar 09, 2019 2:50 pm
Why is it that the half-life of a first order reaction doesn't depend on initial concentration?

### Re: Half-Life 1st Order Reaction

Posted: Sat Mar 09, 2019 11:14 pm
Yes, it is applicable to all first order rate reactions.

### Re: Half-Life 1st Order Reaction

Posted: Sat Mar 09, 2019 11:21 pm
The initial concentration gets cancelled out when you derive the equation. Thus you end up with the equation t1/2 = 0.693/k