NaOH completely dissociates in water solution: NaOH --> Na+ + OH- Therefore, the concentration of OH- ions is equal to the concentration of the solution: c(OH-) = c(NaOH) = 0.001 According to water self-ionization equation, Kw = c(H+)c(OH-) = 10-14 Hence, c(H+) = Kw/c(OH-) = 10-14/10-3 = 10-11 pH = - lg c(H+) = 11 So, the correct option is (d): 11
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