Two steps.
Solve for pOH = -Log (OH^-) = -log(6.0 x 10‑4 M) = ?
Then pH + pOH = pKw = 14. You know pOH and pKw so solve for pH.
Post your work if you get stuck.
If the OH- ion concentration in an aqueous solution at 25.0 oC is measured as 6.0 x 10‑4 M, then the pH of the solution is
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