J – TPS• Why did Edward Norton’s skin start to burn off

when Brad Pitt put the powder on his skin?• What was happening at the chemical level?

Today’s Learning Targets• 6.2 – I can describe what an acid and base are

using the idea of hydrogen ion donation and hydrogen ion accepting.

• 6.3 – I can characterize a compound as either a strong acid/base or weak acid/base based on how much it dissociates.

Arrhenius Acids/Bases

• An Arrhenius acid gives a H+ to a solution in an acid/base reaction– An Arrhenius acid will have a H in its

chemical compound (e.g. HCl, HNO3, H2SO4, etc.)

• An Arrhenius base gives an OH- to a

solution in an acid/base reaction– An Arrhenius base will have an OH in its

chemical compound (e.g. NaOH, KOH, Ca(OH)2, etc.).

Bronsted-Lowry Acids/Bases• Refined Arrhenius’ theory of

acids/bases• Bronsted-Lowry Acid – Donate

(give) a H+ to solution• Bronsted-Lowry Acid – Accept

(take) a H+ from solution.• All Arrhenius acids/bases are

Bronsted-Lowry acids/bases, but not all Bronsted-Lowry acids/bases are Arrhenius acids/bases.

Class Example

• Label the acid, base, and salt in the following reaction. Identify the acids and bases as either Arrhenius, Bronsted-Lowery, or both.

HClO3 + KOH H2O + KClO3

My Turn

• Label the acid, base, and salt in the following reaction. Identify the acids and bases as either Arrhenius, Bronsted-Lowery, or both.

H2SO4 + RbOH H2O + RbHSO4

Strength of Acids/Bases

• Acids/Bases can be classified as strong or weak based on how much it disassociates.

• Disassociate – To break apart• Acids/Bases that completely dissociate are called

strong acids/bases• Acids/Bases that only partially dissociate are

called weak acids/bases– A solution of weak acid/base has some in the

acid/base form and some in the broken apart form.

Strong Acids

• HI• HBr• HCl• HClO4

• HClO3

• H2SO4

You must memorize

these!

Strong Bases

• Ca(OH)2

• Sr(OH)2

• Ba(OH)2

• NaOH• KOH• RbOH• CsOH

You must memorize

these!

ALL ACIDS/BASES THAT ARE NOT ON THIS LIST ARE WEAK ACIDS/BASES

Summarize

Acid/Base Simulator• With a partner of your choice, take out a

computer and the handout you picked up on the way in.

• Complete the acid/base dissociation activity

Work Time

Complete the worksheet you picked up when you came in.

Learning Log Assessment

Rate yourself 1 – 4 on LTs 6.1, 6.2, and 6.3

Exit Slip

1. What are two properties of an acid?2. What is an Arrhenius acid?3. What makes something a strong or weak base?

Learning Log Assessment

Using your exit slip score, re-rate yourself on LTs 6.1, 6.2, and 6.3