$$pH = -\log_{10}[H^+]$$

where [H^+] is the concentration of hydrogen ions in moles per liter (mol/L). Rearranging the formula, we get:

$$[H^+] = 10^{-pH}$$

Substituting the given pH value of 7.5 into the formula, we get:

$$[H^+] = 10^{-7.5} = 3.16 \times 10^{-8}$$

Therefore, the value of H for a pH of 7.5 is 3.16 x 10^-8 mol/L.