Unit 5: Acid-Base Calculations Lesson 5: Hydrolysis

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Presentation transcript:

Unit 5: Acid-Base Calculations Lesson 5: Hydrolysis

Hydrolysis The hydrolysis of a salt is a reaction between water and the cation and/or anion in that salt, so as to produce an acidic or basic solution. Note: All salts are considered to be 100% ionized in water. 5 min

Spectator Ions in Hydrolysis The conjugates of strong acids and bases do not undergo hydrolysis and are thus spectator ions in this type of reaction. They are (memorize these!): - The cations of the alkali metals and alkaline earth metals. - The first five anions found at the top right of the “Relative Strengths” table.

Predicting a Hydrolysis Reaction: Determine the ions produced by dissociation. Discard spectators. Determine whether each remaining ion will act as an acid or a base (use Ka and Kb values if needed).

Brain Break! Climb the ladders by changing one letter at a time to get from one word to the other.

Examples Determine whether each solution will be acidic, basic, or neutral: NaCl NH4Cl NaHC2O4 NH4NO2

Your Turn: Will a solution of Al(H2O)5(OH)(NO3)2 be acidic, basic, or neutral?

Homework: Pg. 148 #69 (a, c, e, etc.)