Question

A sample of blood or tears has a pH of 7.4. What is the hydronium ion concentration of this solution?

Answer 1

`4.0 × 10^-8\ "M"`

Explanation:

`"pH" = -log["H"^+]`

`7.4 = -log["H"^+]`

`["H"^+] = 10^-7.4 ≈ 4.0 × 10^-8\ "M"`