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A solution has a hydrogen ion (or hydronium ion) concentration of 1.00 × 10–9 M. What is the pH of the solution? 7.5 8.0 9.0 8.5

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A solution that has hydrogen ion concentration higher than 10^-7 mol/L is acidic.
A solution that has hydrogen ion concentration lower than this is alkaline. 
pH is a measure of ion concentration. Solution with pH less than 7 are acidic, while those with pH higher than 7 are basic or alkaline. Solution with pH 7 are neutral solutions.
In our case , the hydrogen ion concentration is 1x10^-9 M, which is lower than 10^-7, so the solution is alkaline and its pH value is higher than 7. 
The pH can be calculated with the formula: pH=-log(H+)=-log(10^-9)=9

A solution with a hydrogen ion concentration of 1.00 × 10⁻⁹ M will have the pH or the hydrogen ion potential of 9.0. Thus option C is correct.

What is pH?

pH is the measurement of the hydrogen ion concentration that gives the estimation of the acidic or the alkalinity of the solution. A concentration higher than the 10⁻⁷ mol/L is acidic and less than it is basic.

pH = -log(H⁺)

= -log(10⁻⁹)

= 9

Therefore, the pH of the solution is 9.

Learn more about pH here:

https://brainly.com/question/2279381

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