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The concentration of hydrogen ion in a sample of soft drink is 3.8 × 10–3M. What is its pH? 

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pH = – log[3.8 × 10–3

= – {log[3.8] + log[10–3 ]} 

= – {(0.58) + (– 3.0)} 

= – {– 2.42} = 2.42 

Therefore, the pH of the soft drink is 2.42 and it is acidic.

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