Answer:
The correct answer is pH=8.9
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