The [OH1-] with a pH of 5 is
the pOH is 9, so OH conc is 10^-5
10-9 or 10-5 bobpursely
(OH^-) = 10^-9 is correct.
To determine the hydroxide ion concentration ([OH-]) given a pH value of 5, we need to use the equation for the relationship between pH and pOH.
The pH scale is a logarithmic scale that measures the concentration of hydrogen ions ([H+]) in a solution. The pOH scale is also a logarithmic scale that measures the concentration of hydroxide ions ([OH-]) in a solution. The sum of pH and pOH in any solution at a given temperature is always equal to 14.
The equation to calculate pOH is:
pOH = 14 - pH
Substituting the given pH value of 5 into the equation:
pOH = 14 - 5
pOH = 9
Now that we have the pOH value, we can determine the hydroxide ion concentration ([OH-]) using the equation:
[OH-] = 10^(-pOH)
Substituting the pOH value of 9 into the equation:
[OH-] = 10^(-9)
Calculating this mathematically, we find:
[OH-] = 1 x 10^(-9) or 0.000000001 M
Therefore, the hydroxide ion concentration ([OH-]) with a pH of 5 is approximately 0.000000001 M.