Hydroxide ion concentration from hydrogen ion concentration, or the reverse, using Kw

1. A.
   $2.5\times10^{-13}$ M
2. B.
   $5.0\times10^{-2}$ M
3. C.
   $2.0\times10^{-13}$ M
4. D.
   $4.2\times10^{-12}$ M

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1. A.
   $0.125$ mol/L
2. B.
   $0.125 \times 10^{-12}$ mol/L
3. C.
   $0.0125$ mol/L
4. D.
   $0.125 \times 10^{-10}$ mol/L

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