Chemistryhard · Past Paper
What is the concentration of OH- ions in a solution with a pH of 10 at 25°C?
A$10^{-10} M$
B$10^{-4} M$
C$10^{-7} M$
D$10^{-14} M$
✓ Correct Answer: B — $10^{-4} M$
pH + pOH = 14. If pH = 10, then pOH = 4. [OH-] = 10^-pOH = 10^-4 M.
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