UNIT 8 ACIDS AND BASES 8.1 What are acids and bases? May 25, 2011 DO NOW: AIM: How do we determine whether a substance is a base or an acid? Please look on the back wall “ Timeline of Units we Covered” 1. What are the ions that form when KCl is dissolved in water? When KCl is dissolved the two ions that form are K + and Cl -

Directions: Please use the textbook print out to fill the chart with the correct information. ACIDS AND BASES

DESCRIPTIONACIDSBASES PROPERTIES ARRHENIUS DEFINITION pH VALUE IN SOLUTION REFERENCE TABLE EXAMPLES ALTERNATE THEORY sour corrosive bitter slippery Contains more OH - Dissociates into IONS Conducts electricity In solution Conducts electricity In solution Contains more H + and H 3 O + Dissociates into IONS Acid is a substance that contains hydrogen and ionizes to produce hydrogen ions in aq. Base is a substance that contains hydroxide group and dissociates to produce Hydroxide ions in aq. TABLE K TABLE L Acid is a hydrogen-ion donor Base is a hydrogen-ion acceptor

pH SCALE #ACID, BASE or NEUTRAL?POSSIBLE pH 14 2Neutral 38 4Base Acid Base 7 11

pH SCALE The more H + ions there are (higher the concentration of H + )  The more ACIDIC it is, the LOWER the pH value The more OH - ions there are (higher the concentration of OH - )  The more BASIC it is, the HIGHER the pH value

INDEPENDENT PRACTICE Complete the PRACTICE section Please complete the classwork