6). Which solution has the lowest pH?

Question

A) 1.3 X10–8 M –OH
B) 1.0 X 10–7 M –OH
C) 5.1 X10–5 M –OH
D) 3.9 X 10–8 M –OH
E) 2.3 X 10–3 M –OH

Answer 1

(H^+)(OH^-) = Kw = 1E-14
If logic won't do it, then substitute into the equation for OH and solve for H^+.