A molecule that donates H1+ ions.<ref>Wile, Dr. Jay L. ''Exploring Creation With Chemistry''. Apologia Educational Ministries, Inc. 1998</ref>
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An Acid is a molecule that donates <math>H^+</math> ions in a chemical reaction. Acids taste sour and turn blue litmus paper red. Acids are covalent compounds, but when dissolved in water, they will conduct electricity.