Understand that a first-order reaction's concentration decays exponentially, that the half-life (time for concentration to drop by half) depends only on the rate constant — not on the starting concentration — and that a bigger rate constant means a shorter half-life.
Concentration: C(t) = C0·e^(−kt)Half-life: t₁/₂ = ln(2) / kScrub time to exactly the computed half-life. Confirm the concentration has dropped to about half of C0.
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