Posted by **Taylor** on Tuesday, October 13, 2009 at 10:53am.

Can someone please help me with this question? I don't even know were to begin!

1. What is the relationship (i.e. direct or inverse) between pH and hydrogen ion concentration? Remembering that pH= -log[H+].

Thanks for the help!

- Chemistry 130 -
**Dr Russ**, Tuesday, October 13, 2009 at 10:59am
[H+}=10^-5 pH=5

[H+]=10^-2 pH=2

Thus:

The greater the hydrogen concentration the lower the pH. So is this direct or inverse relationship?

- Chemistry 130 -
**GK**, Wednesday, October 14, 2009 at 9:43pm
pH = -log[H+]

The above relationship can also be expressed as:

[H+] = 10^(-pH)

or

[H+] = 1 / 10^(pH)

That shows the hydrogen ion concentration is inversely proportional to the pH.

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