What is the difference between acids and bases? From the PHET Acid and Base Simulation A neutral atom has the same number of protons and electrons. Ions are atoms or molecules with + or – charges because they either lost or gain electrons. See diagram below! Neutral H atom compared to an + H ion Water molecules (aka H2O) can break into H3O+ ions and OH- ions. Water dissassociating into H3O+ and OH- The concentration of H+ ions vs OH- ions. Water is considered a neutral chemical because it has an equal number of H+ ions and OH- ions. Weak acid mixed with water Strong Acid mixed with water Weak Base mixed with water Strong Basemixed with water Strong Acid in Water Strong Base in Water Electricity is created from the flow of electrons. Electrical Conductivity of a Weak Acid Electrical Conductivity of a Strong Acid Electricity is created from the flow of electrons. Electrical Conductivity of a Weak Base Electrical Conductivity of a Strong Base Comparing the Concentrations of Acids .001 Molarity 1.0 Molarity Comparing the Concentrations of Bases .01 Molarity .1 Molarity The End!