Nicotine is a basic substance and its dissociation constant is about 1.0 x 10-6. To prepare a solution
water with 0.01 mol L-1, calculate the PH
Let's call nicotine BH.
.......BH + HOH ==> BH^+ + OH^-
I.....0.01...........0......0
C......-x............x......x
E...0.01-x...........x......x
Substitute the E line into the K expression and solve for x = OH^-. Convert that to pOH, then to pH.