Question

question 6
this occurs when an excess of (extra) h⁺ are added to a solution: (hint: remember the ph scale rectangle analogy with h⁺, oh⁻).
acidity increases and ph increases
acidity decreases and ph increases
acidity increases and ph decreases

Explanation:

The concentration of hydrogen - ions ($H^+$) determines the acidity of a solution. A higher concentration of $H^+$ means higher acidity. The pH is defined as $pH = -\log[H^+]$. So, when more $H^+$ are added, the $[H^+]$ increases. Since pH is inversely related to the logarithm of $[H^+]$, as $[H^+]$ increases, the pH decreases.

Answer:

acidity increases and pH decreases