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Acids are substances that contain hydrogen and produce hydronium ions when they are dissolved in water. Acids produce hydronium ions when they are dissolved in water by producing positively charged hydrogen ions which combine with water. The symbol for hydronium ions is H3O+. As you can see hydronium ions are positively charged.
Sour taste is one of the properties of acidic solutions. You should NEVER taste a solution to test for acidity because acids can cause burns and damages. Acidic solutions can conduct electricity. Acids are corrosive, which means they can eat away certain substances. Acids also react strongly with metals.