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6) (12.5 points) Solid copper hydroxide, Cu(OH)2, is in equilibrium with its ions in solution: \mathrm{Cu}(\mathrm{OH})_{2} \leftrightarrow \mathrm{Cu}^{2+}+2 \mathrm{OH}^{-} \quad \mathrm{K}_{\mathrm{sp}}=10^{-18.6} Find the equilibrium concentration of hydroxide ions (in mg/L).

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