The Yucca Mountain Repository in Nevada, Which Is Intended for the Long-Term

Multiple Choice

The Yucca Mountain repository in Nevada, which is intended for the long-term storage of nuclear waste, has long been mired in controversy.One ongoing concern is whether the stainless-steel alloy containers could be corroded by salts such as calcium fluoride.If the calcium ion concentration in water inside Yucca Mountain is 1.25*10^-3 M, what is the maximum possible concentration of fluoride ion in this water? Assume calcium fluoride K_sp = 2.2 *10^-10 at the temperatures inside the nuclear waste depository.

A) 1.8 *10^-7 M
B) 1.3 *10^-3 M
C) 2.5 * 10^-3 M
D) 4.2 * 10^- M
E) 2.1 * 10^-4 M