An epidemic (from Greek ἐπί epi "upon or above" and δῆμος demos "people") is the rapid spread of disease to a large number of people in a given population within a short period of time.
The question requires us to use the dilution formula , where and are the stock concentration and volume respectively, then and are the dilute concentration and volume respectively.
a. = 1.5 M KCI, =0.20M KCl, =250ml KCl
b.
To prepare the solution 33.3ml of 1.5M KCl is diluted to a total final volume of 250ml.