Kb, Ka, Weak acid, Weak base, pH Scale range, pH 10, pH 4.7, H3O+, OH-, Strong acid, Strong base, Limitation of pH scale, pH = 14 - ?, Soren Sorenson, pH + pOH = ?, Phenolphthalein - colour change + range, Litmus - Colour change + range, Methyl Orange - Colour change + range.

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