Catalyst 1. What is the equilibrium point? 2. What exactly does equilibrium mean? 3. Can you find a situation in your body where this exists? 4. Grade.

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Catalyst 1. What is the equilibrium point? 2. What exactly does equilibrium mean? 3. Can you find a situation in your body where this exists? 4. Grade yourselves in your learning logs for all LT’s End

LECTURE 6.6 – INTRO TO BUFFERS

6.8 – I can identify the conjugate acid and base in a chemical reaction. 6.9 – I can explain what a buffer is, draw a titration curve for a buffered solution, and explain why these are essential to maintaining life in humans. Today’s Learning Target

What are conjugate acids and bases?

Conjugate Base – The compound that remains after a Bronsted-Lowry acid has given off its H +. Conjugate Acid – The compound that is formed when a Bronsted-Lowry base gains a H +. HA + B  A - + BH + I. Conjugate Acids and Bases

Identify the acid, base, conjugate acid, and conjugate base: HBr + NaOH  H 2 O + NaBr Class Example

Identify the acid, base, conjugate acid, and conjugate base: H 2 SO 4 + KOH  KHSO 4 + H 2 O Table Talk

Identify the acid, base, conjugate acid, and conjugate base: HI + NH 3  NH I - Stop and Jot

What is equilibrium?

Weak acids and bases do not completely dissociate. This means that they exist in equilibrium There are both reactant and products present in a solution of weak acid or base. I. Weak Acid and Base Equilibrium

Equilibrium

SUMMARIZE

Learning Log Assessment Rate yourself 1 – 4 on LTs 6.8 and 6.9

Which Card? Raise your table’s card in the air for the category that you think each compound belongs to. Your choices are: 1.Bronsted – Lowry Acid 2.Bronsted – Lowry Base 3.Arrhenius Acid 4.Arrhenius Base 5.Conjugate Acid 6.Conjugate Base

Which Card? You run the following reaction: HCOOH + OH -  COOH - + H 2 O 1. What is OH - ? 2. What is HCOOH? 3. What is COOH - 4. What is H 2 O?

Which Card? You run the following reaction: NH 3 + HBr  NH Br - 1. What is NH 3 ? 2. What is HBr? 3. What is NH 4 + ? 4. What is Br - ?

Which Card? You run the following reaction: HF + LiOH  LiF + H 2 O 1. What is LiOH? 2. What is HF? 3. What is LiF? 4. What is H 2 O?

Review Stations Rotate between the 8 stations (9 for honors) ROTATE! Station 1 – LT 6.1 Station 2 – LT 6.2 Station 3 – LT 6.3 Station 4 – LT 6.4 Station 5 – Calculating logs Station 6 – LT 6.5 Station 7 – LT 6.6 Station 8 – LT 6.6 Honors Station 9 – LT 6.8 and 6.9

Closing Time Test on Friday Rough Draft of Lab Report due Tuesday