Question

A sample of blood or tears has a hydrogen ion concentration of 3.98e-8M. What is the pH of this solution?

Answer 1

Well...`pH=-log_10[H_3O^+]`

Explanation:

And so...

`-log_10(3.98xx10^-8)=7.40`...

I think saliva, and more so sweat, is slightly acidic....and of course stomach acid is very acidic...