Hydrogen ion concentration in mol/L in a solution of pH = 5.4 will be:

3.98 × 10⁻⁶
3.68 × 10⁻⁶
3.88 × 10⁶
3.98 × 10⁶

Correct answer: 3.98 × 10⁻⁶

Solution

The hydrogen ion concentration can be calculated using the formula [H+] = 10^(-pH). For a pH of 5.4, this results in a concentration of approximately 3.98 × 10⁻⁶ mol/L, confirming option A as the correct answer.

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