Answer :

Final answer:

To determine the number of dissociated OH- ions in a solution with a known pH, we first need to calculate the OH- concentration using the ion product of water. Then, the volume of solution is converted to L and multiplied by the OH- molarity to find the moles. Finally, Avogadro's number is used to find the total number of OH- ions.

Explanation:

The pH of the solution indicates that the hydrogen ion concentration ([H+]) is 10^-1.37 M. Using the ion product of water Kw = [H+][OH-] = 1.0 x 10^-14 at 25°C. Therefore [OH-] can be found by using this formula: [OH-] = Kw / [H+] = 1.0 x 10^-14 /10^-1.37.

To find the number of OH- ions, firstly, convert the volume from mL to L, and find the moles of OH- by multiplying the volume in L by the molarity. Then, use Avogadro's number (6.022 x 10^23 ions/mole) to determine the number of OH- ions.

So, the number of dissociated OH− ions is found by multiplying the moles of OH− by Avogadro's number.

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