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Calculate the pH of a saturated solution of Mg(OH)2 in 0.1 M NaCl, given Ksp = 1.8 x 10-11 and activity coefficient for OH- is 0.90.

Calculate the pH of a saturated solution of Mg(OH)₂ in 0.1 M NaCl, given K_sp = 1.8 x 10^-11 and activity coefficient for OH^- is 0.90.