Taking into account the definition of pH and pOH, the concentration of H⁺ ions at pH=8 is 1×10⁻⁸ M and the concentration of OH⁻ ions at pH=8 is 1×10⁻⁶ M.
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⁺]
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⁻]
The following relationship can be established between pH and pOH:
pOH + pH= 14
In this case, pH=8. Replacing in the definition of pH:
8= - log [H⁺]
Solving:
[H⁺]= 10⁻⁸= 1×10⁻⁸ M
Finally, the concentration of H⁺ ions at pH=8 is 1×10⁻⁸ M.
Being pH= 8, pOH is calculated as:
pOH + 8= 14
pOH= 14 - 8
pOH= 6
Replacing in the definition of pOH the concentration of OH⁻ ions is obtained:
- log [OH⁻]= 6
Solving
[OH⁻]= 10⁻⁶= 1×10⁻⁶ M
Finally, the concentration of OH⁻ ions at pH=8 is 1×10⁻⁶ M.
Learn more about pH and pOH:
brainly.com/question/16032912
brainly.com/question/13557815
#SPJ1
