The $pH$ of an acidic solution is $4.70$. Calculate the concentration of $OH^-$ ions. $(pK_w = 14)$
- A$5 \times 10^{-10} \ M$
- B$4 \times 10^{-10} \ M$
- C$2 \times 10^{-5} \ M$
- D$9 \times 10^{-4} \ M$
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