What is the H+ ion concentration of this solution?

Question

A solution is made by dissolving 0.0112 g KOH in enough water to make 1.0 liter of solution. What is the H+ ion concentration of this solution?

a. ) 2.0 x 10-3 M
b. ) 8.0 x 10-2 M
c. ) 1.2 x 10-13 M
d. ) 5.0 x 10-11 M
e. ) 5.0 x 10-12 M

Answer 1

Convert g KOH to mols KOH.
M = mols/L of solution.
(OH^-) same as (KOH)
(H^+)(OH^-) = Kw = 1 x 10^-14
You know (OH^-) and Kw; solve for (H^+). The answer is about 10^-11 if I didn't make a mistake but you will need to work it out to get the exact answer.