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Question
Draw the structure of the stable positive ion formed when an acid dissolves in water.
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Solution
The stable positive ion formed when an acid dissolves in water is hydronium ion.
The structure of hydronium ion (H3O+) is as follows:
\[\ce{HCl + H2O -> H2O+ + Cl-}\]
\[\begin{array}{cc}
\ce{H - \overset{\bullet\bullet}{\mathbf{O}} - H}\\
|\\
\phantom{.}\ce{H}\
\end{array}\]
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