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$\ \ \ \ \ \ \ \ \text{H}\ \ \ \ \ \text{H}\ \ \ \ \ \text{H}\ \ \ \ \text{H}\ \ \ \ \ \text{H}\ \ \ \ \ \text{H}\ \ \ \ \ \text{H}\\\ \ \ \ \ \ \ \ \ |\ \ \ \ \ \ |\ \ \ \ \ \ \ |\ \ \ \ \ \ |\ \ \ \ \ \ \ |\ \ \ \ \ \ \ |\ \ \ \ \ \ \ |\\\text{H}-\text{C}-\text{C}-\text{C}-\text{C}-\text{C}-\text{C}-\text{C}=\text{O}\\\ \ \ \ \ \ \ \ \ |\ \ \ \ \ \ |\ \ \ \ \ \ \ |\ \ \ \ \ \ \ |\ \ \ \ \ \ |\ \ \ \ \ \ \ |\\\ \ \ \ \ \ \ \ \text{H}\ \ \ \ \text{H}\ \ \ \ \ \ \text{H}\ \ \ \ \ \text{H}\ \ \ \ \text{H}\ \ \ \ \ \text{H}$
$\text{Mg}(\text{OH)}_2\ +\ \text{HCl}\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ }\text{MgCl}_2\ +\ \text{H}_2\text{O}$