SOLUTION: The hydrogen ion concentration of a dilute solution of an acid is measured to be [H+] = 2.0x10-4. Determine the pH of the solution. Im not really sure where to start to achieve

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Question 155503: The hydrogen ion concentration of a dilute solution of an acid is measured to be [H+] = 2.0x10-4. Determine the pH of the solution.
Im not really sure where to start to achieve the correct answer. If someone could show me the steps,and the correct answer,it would be greatly apperciated.
Answer by scott8148(5880) About Me  (Show Source):
You can put this solution on YOUR website!
pH is the logarithm of the hydrogen ion concentration, multiplied by -1

log[H+]=log(2.0x10^-4)=-3.7 (approx)

so the pH is 3.7