Why is there a negative sign in front of the 'logarithm' in the formula for pH?
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Explanation:
A negative logarithmic scale is used because the numbers are all less than 1, and vary over a wide range. Since the pH is the negative logarithm of the hydrogen ion concentration, low pH numbers, e.g. pH 6.2, indicate relatively high hydrogen ion concentrations, i.e. an acidic solution.
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