Question

What is the hydronium ion concentration in a solution of HCl that has a pH of 4.65?

Answer 1

9.35

Step-by-step explanation:

pH = 4.65

pOH = ?

But pH + pOH = 14

4.65 + pOH = 14

pOH = 14 - 4.65

pOH = 9.35

The pOH of the solution is 9.35

Answer 2

A pH of 4.65 means it has a pOH of:
14 - 4.65
= 9.35

pOH = -log[OH-]
[OH-] = 10^(-9.35)
[OH-] = 4.47 x 10⁻¹⁰ mol/dm³