which of these solutions has the highest concentration of h+? solution a, ph = 12.5 solution b, ph = 7.0…

Explanation:

Step1: Recall pH - $H^+$ relationship

The formula for pH is $pH = -\log[H^+]$, so $[H^+]=10^{-pH}$.

Step2: Calculate $[H^+]$ for solution A

For solution A with $pH = 12.5$, $[H^+]_A=10^{- 12.5}$.

Step3: Calculate $[H^+]$ for solution B

For solution B with $pH = 7.0$, $[H^+]_B=10^{-7.0}$.

Step4: Calculate $[H^+]$ for solution C

For solution C with $pH = 2.5$, $[H^+]_C=10^{-2.5}$.

Step5: Compare the values

Since the function $y = 10^{-x}$ is a decreasing - function of $x$, and $2.5<7.0 < 12.5$, we have $10^{-2.5}>10^{-7.0}>10^{-12.5}$. So solution C has the highest $H^+$ concentration.

Answer:

C. solution C, pH = 2.5