Question

The [OH-] ion concentration of a sample is 1 × 10-10 M. What is the concentration of [H+] in the sample at 25°C?

A. 1 × 10-14 M
B. 1 × 10-4 M
C. 1 × 10-10 M
D. 1 × 10-6 M

If the pH of a nitric acid solution is 2.34, then what is the molarity of nitric acid in the solution?

A. 1.6 × 10-4 M
B. 3.8 × 10-3 M
C. 2.2 × 10-2 M
D. 4.6 × 10-3 M

Answer 1

[OH-] [H+]= Kw = 1 × 10-14 M

Answer 2

pH= -log [H+]

[H+] = 10 ^-pH