What will be the resultant pH when 200 mL of an aqueous solution of HCl (pH = 2) is mixed with 300 mL of an aqueous solution of NaOH (pH = 12)?
Since, according to the question;
200 ml of an aqueous solution of HCl is mixed with 300 ml of an aqueous solution of NaOH.
The given pH of HCl is 2;
The given pH of NaOH is 12;
We have to find the resultant pH.
[HCl] =
[NaOH] =
So, the reaction goes like this :

Since , before reaction;

After reaction;
0 1 2 2
We will be finding the concentration of the hudroxide ion first.
left from NaOH =
M


The Ph of the hydroxide ion is calculated as
Since , we know that
The
of the hydrogen ion...