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1. What is pH? What is its significance?2. The concentration of hydrogen ion in a sample of soft drink is 3.8 × 10-3. What is its pH?

Answer»

1. pH is a logarithmic scale used to express the hydronium ion concenration in molarity more conveniently. The pH of a solution is defined as negative logarithm to the base 10 of the activity of hydrogen ion.

pH = — log aH+ = —log[H+]

2. [H+] = 3.8 × 10-3 

pH = -log[H+]

= -log [3.8 × 10-3] = -(-2.42) = 2.42



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