Need help with a pH qu. A Level

"A solution of potassium hydroxide has a pH of 11.90 at 25^C. Calculate the concentration of potassium hydroxide in the solution"

Can anyone explain how I do this, I thought I knew all my formulas but I can't work it out, I'v looked at the mark scheme but it still hasn't clicked... :s-smilie:

Please can someone help me?? Please!!

Reply 1

happyhappyperson

OP

And now I've found another one I can't do!! ~ I'm going to F_A_I_L!!!

pH = -log(10)[H+]

is that a full question?

[oh-][h+]= 10^-14

You can convert pH into [H+] using 10^-pH

Reply 6

happyhappyperson

OP

Polymorphing

You can convert pH into [H+] using 10^-pH

Ooh, that might be what I forgot...ThAnK yOu!! :biggrin:

Reply 7

AVAINTEX

6

happyhappyperson

"A solution of potassium hydroxide has a pH of 11.90 at 25^C. Calculate the concentration of potassium hydroxide in the solution"

Can anyone explain how I do this, I thought I knew all my formulas but I can't work it out, I'v looked at the mark scheme but it still hasn't clicked... :s-smilie:

Please can someone help me?? Please!!