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Here's how to calculate the moles of hydroxide ions (-OH) in a one-liter solution with a pH of 8:
1. Calculate pOH: pH + pOH = 14. So, pOH = 14 - 8 = 6
2. Calculate [OH-] concentration: [OH-] = 10^-pOH = 10^-6 M
3. Moles in one liter: Since molarity is moles per liter, there are 10^-6 moles of hydroxide ions in one liter of the solution.