Question

question 1 of 10 what is the ph of water? a. -7 b. 1×10⁻⁷ c. 1×10⁷ d. 7

Explanation:

Pure water at 25°C has a hydrogen - ion concentration of $1\times10^{-7}$ M. The pH is defined as $pH = -\log[H^+]$. Substituting $[H^+]=1\times10^{-7}$ M into the formula gives $pH = -\log(1\times10^{-7})=7$.

Answer:

D. 7