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Desperate help chemistry a level

I just don’t understand why the answer is

[H+]= 4.0 x 10-15 moldm-3
pH= 14.40

The question is:

Calculate the pH at 25 C of 2.5M NaOH

The question before that (if it’s any indication of what to do ) is: calculate the pH at25C of 2.00 M HCl and the answer for that is -0.30
Original post by arielynjoan
I just don’t understand why the answer is

[H+]= 4.0 x 10-15 moldm-3
pH= 14.40

The question is:

Calculate the pH at 25 C of 2.5M NaOH

The question before that (if it’s any indication of what to do ) is: calculate the pH at25C of 2.00 M HCl and the answer for that is -0.30


pH = -log10[H+(aq)]

and

kw = [H+][OH-] = 1.0 x 10-14

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