(Solved): 11. The pH of a substance is given by the formula pH=log[H+], where H+is its concentration of hy ...

11. The $\mathrm{pH}$ of a substance is given by the formula $\mathrm{pH}=?\log \left[{\mathrm{H}}^{+}\right]$, where ${\mathrm{H}}^{+}$is its concentration of hydrogen ions in $\mathrm{mol}/\mathrm{L}$. a. A certain substance has a concentration of $\mathrm{H}+$ ions of $0.004\mathrm{mol}/\mathrm{L}$. Classify it as acid or base. b. A substance has a $\mathrm{pH}$ of 9.5. Find its concentration of hydrogen ions.