Question

the acidity of a liquid solution (ph) depends on the concentration of hydrogen ions (c), and can be determined using this formula.
$\text{ph} = -\log_{10}(c)$
what is the value of $c$ when the acidity of the liquid solution is 5 ph units?
\\(\circ\\) a. $-5_{10}$
\\(\circ\\) b. $5^{-10}$
\\(\circ\\) c. $-10^5$
\\(\circ\\) d. $10^{-5}$

Explanation:

Step1: Substitute pH=5 into formula

$5 = -\log_{10}(c)$

Step2: Rearrange to isolate log term

$\log_{10}(c) = -5$

Step3: Convert to exponential form

$c = 10^{-5}$

Answer:

D. $10^{-5}$