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 an h+ concentration of 5.01×10^(-8). what is its ph? round your answer to the nearest tenth.

Explanation:

Step1: Identify the formula for pH

The formula for pH is $pH = -\log(H^{+})$, where $H^{+}=5.01\times 10^{-8}$.

Step2: Substitute the value of $H^{+}$ into the formula

$pH=-\log(5.01\times 10^{-8})$.
Using the property of logarithms $\log(ab)=\log(a)+\log(b)$, we have $pH=-(\log(5.01)+\log(10^{-8}))$.
Since $\log(10^{-8})=- 8$ and $\log(5.01)\approx0.70$, then $pH=- (0.70 - 8)$.

Step3: Calculate the pH value

$pH=-0.70 + 8=7.3$.

Answer:

$7.3$