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a solution with an [OH-] concentration of 1.20 x 10-7M has a pOH and pH of?

Sagot :

CintiaSalazar

Taking into account the definition of pH and pOH, the solution has a pOH of 6.92 and a pH of 7.08.

Definition of pH

pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

The pH is defined as the negative base 10 logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions or H₃O⁺:

pH= - log [H⁺]= - log [H₃O⁺]

Definition of pOH

Similarly, pOH is a measure of hydroxyl ions in a solution and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:

pOH= - log [OH⁻]

Relationship between pH and pOH

The following relationship can be established between pH and pOH:

pOH + pH= 14

pOH and pH in this case

A solution has an [OH⁻] concentration of 1.20×10⁻⁷ M. Replacing in the definition of pOH:

pOH= - log (1.20×10⁻⁷ M)

Solving

pOH= 6.92

Then, pH is calculated as:

pH + 6.92= 14

pH= 14 - 6.92

pH= 7.08

Finally, the solution has a pOH of 6.92 and a pH of 7.08.

Learn more about pH and pOH:

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