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What is the [OH-] of each solution?
(a) 0.4 M NaOH, pH = 13.6
(b) 1E-2 M K2CO3, pH = 11.2
(c) 2E-3 M Na3PO4, pH = 12.0
(d) 0.11 M KHCO3, pH = 8.4
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