An alcoholic drink has a $pH = 4.7$. What is the $OH^{-}$ ion concentration of this solution? (Given: $K_w = 10^{-14} \ mol^2/L^2$)
- A$3 \times 10^{-10} \ M$
- B$5 \times 10^{-10} \ M$
- C$1 \times 10^{-10} \ M$
- D$5 \times 10^{-8} \ M$
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