Posted by **Jon** on Friday, March 23, 2007 at 9:33pm.

this makes absolutley no sense I plug all this into my calculator but I get different results.

The hydronium ion concentration can be found from the pH by the reverse of the mathematical operation employed to find the pH.

[H3O+] = 10-pH or [H3O+] = antilog (- pH)

Example: What is the hydronium ion concentration in a solution that has a pH of 8.34?

8.34 = - log [H3O+]

- 8.34 = log [H3O+]

[H3O+] = 10-8.34 = 4.57 x 10-9 M

On a calculator, calculate 10-8.34, or "inverse" log ( - 8.34).

Your calculations baffle me.

On my calculator,

INV log(- 8.34) is 4.57E-9 M. So we got the same answer.

You need to figure out what you are doing wrong with your calc.

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