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An acid is a type of chemical that produces sour solutions due to a high concentration of positive hydrogen ions in the solution.

A base is a type of chemical that produces bitter-tasting solutions due to a lack of positive hydrogen ions. Acids and bases combine to generate salts.

The term "neutral" refers to a substance that is in the middle of the acid-base spectrum.

Let's start by figuring out how many moles (n) each purple molecule is. First, solve for $\left[{\text{H}}_{\text{3}}{\text{O}}^{\text{+}}\right]$in scene A.

$\begin{array}{c}\text{pH=-log}\left[{\text{H}}_{\text{3}}{\text{O}}^{\text{+}}\right]\\ \left[{\text{H}}_{\text{3}}{\text{O}}^{\text{+}}\right]{\text{=10}}^{\text{-pH}}\\ {\text{=10}}^{\text{-4.8}}\\ \left[{\text{H}}_{\text{3}}{\text{O}}^{\text{+}}\right]{\text{=1.58脳10}}^{\text{-5}}\text{M}\end{array}$

We can assume the volume is 1 and the concentration = moles for A because the volume in scenes and B are the same. To get the amount of moles per purple molecule, divide the moles by two.

${\text{1.58脳10}}^{\text{-5}}{\text{尘辞濒梅2尘辞濒别肠耻濒别=7.92脳10}}^{\text{-6}}\frac{\text{mol}}{\text{molecule}}$