The concentration of a chemical degrades in water according to first-order kinetics. The degradation constant is 0.2 day−1. If the initial concentration is 100.0 mg · L−1, how many days are required for the con- centration to reach 0.14 mg · L−1?

3566.4 days

Explanation:

The reaction follows a first-order

Rate = kC = change in concentration/time

k = 0.2 day^-1

C = 0.14 mg.L^-1

Co = 100 mg.L^-1

0.2×0.14 = 100 - 0.14/t

t = 99.86/0.028 = 3566.4 days

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.