If the hydroxide ion concentration of an aqueous solution is 3.0 x 10-4, what is the [H+] in the solution? Is the solution acidic, basic, or neutral?

[H+] is 3.31 * 10^-11 M

Solution: Basic

Explanation:

In the question we are given;

Concentration of Hydroxide ion [OH-] as 3.0 * 10^-4 M

We are required to determine the [H+] and whether the solution is acidic, basic or neutral.

We know that;

pOH + pH = 14

and that;

pOH = - log [OH-]

Therefore;

pOH = - log (3.0 * 10^-4)

= 3.52

But;

pH = 14 - pOH

Thus;

pH = 14 - 3.52

= 10.48

But, we know that;

pH = - log[H+]

Therefore;

H + = Antilog - pH

= Antilog - 10.48

= 3.31 * 10^-11

Thus, the concentration of H + ions [H+] is 3.31 * 10^-11 M

Also since the pH is 10.48, then the solution is basic