At 25 °C, 0.0020 mol of HCl(aq) is mixed with 0.0015 mol of NaOH(aq) and diluted to a final volume of 1.00 L. Assuming complete dissociation and additive volumes, what is the hydroxide-ion concentration in the final solution?
a) 5.0×10−8M
b) 2.0×10−11M
c) 1.0×10−7M
d) 2.0×10−10M