for a solution to be classified as acidic, the\nselect one:\n a. hydrogen - ion concentration must be…

for a solution to be classified as acidic, the\nselect one:\n a. hydrogen - ion concentration must be 10^(-7) mol/l\n b. hydrogen - ion and hydroxide - ion concentration must be equal\n c. hydrogen - ion concentration must be greater than the hydroxide - ion concentration.\n d. the hydrogen - ion concentration must be 7 mol/l or greater

for a solution to be classified as acidic, the\nselect one:\n a. hydrogen - ion concentration must be 10^(-7) mol/l\n b. hydrogen - ion and hydroxide - ion concentration must be equal\n c. hydrogen - ion concentration must be greater than the hydroxide - ion concentration.\n d. the hydrogen - ion concentration must be 7 mol/l or greater

Answer

Brief Explanations:

In an acidic solution, the concentration of hydrogen - ions ($H^+$) is higher than the concentration of hydroxide - ions ($OH^-$). A solution with $[H^+]=10^{-7}\ mol/L$ is neutral. When $[H^+]=[OH^-]$, the solution is also neutral. And a hydrogen - ion concentration of 7 mol/L is extremely high and not a general criterion for acidity.

Answer:

C. hydrogen - ion concentration must be greater than the hydroxide - ion concentration.