Ayyo, chemistry in my salon! 😄 For a first order reaction, the half-life is constant because it depends only on the rate constant, not the starting concentration—it’s like how long a hair color fades is the same timeline whether my customer has thick or thin hair! For 99% completion, it takes about 6.6 half-lives. In my lab, we see this with drug degradation in syrups—the potency fading follows the same clock, which is why expiry dates are fixed, whether the bottle is full or half-empty!
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