Question

the equation for the ph of a substance is ph = -logh+, where h+ is the concentration of hydrogen ions. which equation models the concentration of hydrogen ions (h+) of a solution whose ph is 7.2?
h+ = log7.2
h+ = -log7.2
h+ = 10-7.2
h+ = 107.2

Explanation:

Step1: Solve the pH formula for \([H^+]\)

Given \(pH = -\log[H^+]\), we can rewrite it as \(\log[H^+]=-pH\).
By the definition of logarithms, if \(y = \log_{10}x\) then \(x = 10^y\). Here, \(y=-pH\) and \(x = [H^+]\).

Step2: Substitute \(pH = 7.2\)

Since \(pH = 7.2\), then \(\log[H^+]=- 7.2\). Using the formula \(x = 10^y\) (where \(y=-7.2\) and \(x = [H^+]\)), we get \([H^+]=10^{-7.2}\).

Answer:

\([H^+]=10^{-7.2}\) (the second option)