A city's water supply is contaminated with a toxin at a concentration of 0.63 mg/L. Fortunately, this toxin decomposes to a safe mixture of products by first-order kinetics with a rate constant of 0.27 day–1. How long will it take for half of the toxin to decompose?

t = 2,57 days

Explanation:

A reaction follows the first-order kinetics when attend the formula:

Where [A]₀ is the initial concentration of the toxin (0,63mg/L) and [A]t is the half of the initial concentration (0,315mg/L). k is 0,27 day⁻¹ and t is the time the descomposition takes. Replacing:

t = 2,57 days

I hope it helps!

a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.