Question

The equation for the pH of a substance is pH = –log[H+], where H+ is the concentration of hydrogen ions. What is the approximate pH of a solution whose hydrogen ion concentration is 2 x10^-9

Answer 1

PH = -Log(H+ ion ) concentration =-log(2.0(10^-9)) = 8.7

Answer 2

The correct answer is pH=8.9

Step-by-step explanation:

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The formula to calculate the pH is:

pH = -log [H +]

This means that it is the least logarithm of the hydrogen ion concentration.

[H +] = 2 x10 ^ -9

pH = -log (2 x10 ^ -9)

pH = 8.7

We conclude that the correct answer is pH=8.9