Calculate the pH of a 1.6 M KOH solution.
A) 1.60
B) -0.20
C) 0.20
D) 14.20
E) 13.80

Question

Quizplus · Accepted Answer

KOH is a strong base, completely dissociating in water to form K+ and OH- ions.

KOH(s) → K+(aq) + OH-(aq)

Since the concentration of KOH is 1.6 M, the concentration of OH- ions is also 1.6 M.

Using the equation for the dissociation of water,

H2O(l) ⇌ H+(aq) + OH-(aq)

we can find the concentration of H+ ions.

Kw = [H+][OH-]

1.0 x 10^-14 = [H+][1.6]

[H+] = 6.25 x 10^-14 M

Now, we can use the equation for pH to find the pH of the solution.

pH = -log[H+]

pH = -log(6.25 x 10^-14)

pH = 14.20

Therefore, the answer is D) 14.20.

Calculate the PH of a 1