b$.$ When we measure pH$,$ the pH meter is measuring how much hydrogen ion is in the solution, which we would write out properly as $\_\_\_\_\_\_\_\_\_\_\_\_($what is the $$short$-$hand$$ for hydrogen ion?$).$

$$ An acidic solution has $\_\_\_\_\_\_\_\_\_\_\_\_($a lot or a little?$)$ of H$+$ in solution.

$$ A basic $($alkaline$)$ solution has $\_\_\_\_\_\_\_\_\_\_\_\_($a lot or a little?$)$ of H$+$ in solution.