Explain how the concept of reciprocals is used in the calculation of pH.

• A. The negative logarithm of a number is equivalent to the positive logarithm of its reciprocal.
• B. The positive logarithm of a number is equivalent to the negative logarithm of its reciprocal.
• C. Reciprocals are not used in pH calculations.
• D. Reciprocals are only used for calculating hydroxide ion concentration.

Answer: (A)