The pH Scale
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
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The pH scale measures how acidic or basic a solution is, based on hydrogen ion concentration, running 0 to 14 with 7 neutral.
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Pure water sits at pH 7; a solution with more free hydrogen ions than pure water reads below 7.
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Each whole step on the pH scale represents a tenfold change in hydrogen ion concentration, not a fixed, even step.