Suppose the Reaction Pb(s) + 2H⁺(aq) $\rarr$ Pb²⁺(aq) + H₂(g) Is Carried Out at PH = 4

Multiple Choice

Suppose the reaction Pb(s) + 2H⁺(aq) $\rarr$ Pb²⁺(aq) + H₂(g) is carried out at pH = 4.00 and at a hydrogen gas pressure of 1.00 atm. The concentration of lead(II) ions that causes this reaction to be at equilibrium is

A) 2.5 M.
B) 1.6 * 10^-2 M.
C) 2.5 * 10^-4 M.
D) 1.6 * 10^-6 M.
E) 0.40 M.