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The pH scale is an inverse logarithmic scale. What is its full range?
A0 to 7
B0 to 10
C0 to 14
D1 to 100
Answer & Solution
Correct answer: C. 0 to 14
1. The pH scale was deliberately constructed to span the practical range of hydrogen ion concentrations encountered in aqueous chemistry.
2. The text states: "The pH scale is, as previously mentioned, an inverse logarithm and ranges from 0 to 14."
3. A pH of 7 is the midpoint (neutral), not the top of the scale, which is why "0 to 7" alone would only capture the acidic half.
4. So the complete pH scale runs from 0 to 14, covering both the acidic and basic ranges.
_Source: OpenStax Biology Ch 2 "The Chemical Foundation of Life", p.52 §2.2 | Water_
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