Question

ph measures the acidity of a substance, and is described by the equation ph = - log (h+), where h+ is the concentration of hydrogen ions. a solution has a ph of 7.44. what is its concentration of h+? a 1.70×10³ b 5.57×10⁻¹ c 2.75×10⁻⁷ d 3.63×10⁻⁸

Explanation:

Step1: Rearrange pH formula

Given $pH = -\log(H^{+})$, we can rewrite it as $H^{+}=10^{-pH}$.

Step2: Substitute pH value

Substitute $pH = 7.44$ into $H^{+}=10^{-pH}$, so $H^{+}=10^{- 7.44}$.
Using a calculator, $10^{-7.44}\approx3.63\times10^{-8}$.

Answer:

D. $3.63\times10^{-8}$