Calculate the pH of a solution with [H+] = 1.8 x 10-5 M

A)4.74
B)1.8
C)5
D)8.31

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Bohr's equation

Explanation:  https://study.com/academy/answer/complete-the-sentence-concerning-the-energy-level-diagram-for-the-hydrogen-atom-the-equation-relating-the-energy-separation-between-levels-in-the-h-atom-to-the-number-of-the-level-n-is-called-the-equation.html

Answer and Explanation: The equation relating the energy separation between levels in the H atom to the number of the level (n) is called the Bohr's equation.