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\mbox does not draw a box inside align*
\mbox doesn't work inside align*:
\begin{document}
\usepackage{mhchem}
\begin{align*}
\ce{K_w} &= \ce{[H3O+][OH^-]} \\
-\log \ce{K_w} &= -\log ( \ce{[H3O+][OH^-]} ) \\
-\log ...
