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The pH is the cologarithm of the activity of hydrogen ion in solutions; pH 14 is the pH of a strong base.

Q: Is a substance with a pH of 14 a strong base?
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The pH is the cologarithm of the activity of hydrogen ion in solutions; pH 14 is the pH of a strong base.

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Scientists can use pH as an indicator of the relative acidity (pH < 7) or alkalinity (pH > 7) of an aqueous solution compared with a pH neutral (pH 7.0 at 25 degrees celsius) solution such as water. For example, if a scientist wants to grow mammalian cells in tissue culture they must use aqueous buffers, serum and growth medium at a pH within the healthy range of a living system. Deviations from the human physiologic pH of 7.365 can denature enzymes and proteins vital to the cell's metabolism.

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