3. what do you think adding water (dilution) changes how acidic or basic the liquid is? explain your thinking.

Brief Explanations:

When water is added to an acidic or basic liquid, it dilutes the concentration of hydrogen ions ((H^{+})) in an acid or hydroxide ions ((OH^{-})) in a base. For an acid, the formula for pH is (pH = -\log[H^{+}]). As ([H^{+}]) decreases (due to dilution), the pH value increases (moving towards 7, making it less acidic). For a base, the pOH is related to ([OH^{-}]) by (pOH=-\log[OH^{-}]), and pH = 14 - pOH. As ([OH^{-}]) decreases (due to dilution), pOH increases, and pH decreases (moving towards 7, making it less basic).

Answer:

Adding water (dilution) makes an acidic liquid less acidic (pH increases towards 7) and a basic liquid less basic (pH decreases towards 7). This is because dilution lowers the concentration of (H^{+}) (in acid) or (OH^{-}) (in base), and pH (related to (H^{+}) concentration) or pOH and then pH (for bases) change accordingly.