You have two solutions,$A$ and $B$. The $pH$ of solution $A$ is $6$ and the $pH$ of solution $B$ is $8$. Which solution has a higher hydrogen ion concentration? Which of these is acidic and which one is basic?

(A) The $pH$ scale measures the acidity or alkalinity of a solution.
$A$ $pH$ value of less than $7$ indicates an acidic solution,while a $pH$ value greater than $7$ indicates a basic (alkaline) solution.
Since the $pH$ of solution $A$ is $6$ $(< 7)$,it is acidic.
Since the $pH$ of solution $B$ is $8$ $(> 7)$,it is basic.
The concentration of hydrogen ions $[H^+]$ is inversely proportional to the $pH$ value.
Therefore,solution $A$ with a lower $pH$ $(6)$ has a higher hydrogen ion concentration than solution $B$ with a higher $pH$ $(8)$.